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Chemical Structure| 84547-84-2 Chemical Structure| 84547-84-2

Structure of 84547-84-2

Chemical Structure| 84547-84-2

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CAS No.: 84547-84-2

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Product Details of [ 84547-84-2 ]

CAS No. :84547-84-2
Formula : C5H5BrN2O2
M.W : 205.01
SMILES Code : O=C(C1=C(Br)C=NN1C)O
MDL No. :MFCD00463982
InChI Key :YXIJCAVZGBGUKM-UHFFFAOYSA-N
Pubchem ID :673686

Safety of [ 84547-84-2 ]

GHS Pictogram:
Signal Word:Warning
Hazard Statements:H302-H315-H319-H335
Precautionary Statements:P261-P305+P351+P338

Computational Chemistry of [ 84547-84-2 ] Show Less

Physicochemical Properties

Num. heavy atoms 10
Num. arom. heavy atoms 5
Fraction Csp3 0.2
Num. rotatable bonds 1
Num. H-bond acceptors 3.0
Num. H-bond donors 1.0
Molar Refractivity 38.15
TPSA ?

Topological Polar Surface Area: Calculated from
Ertl P. et al. 2000 J. Med. Chem.

55.12 ?2

Lipophilicity

Log Po/w (iLOGP)?

iLOGP: in-house physics-based method implemented from
Daina A et al. 2014 J. Chem. Inf. Model.

1.18
Log Po/w (XLOGP3)?

XLOGP3: Atomistic and knowledge-based method calculated by
XLOGP program, version 3.2.2, courtesy of CCBG, Shanghai Institute of Organic Chemistry

0.78
Log Po/w (WLOGP)?

WLOGP: Atomistic method implemented from
Wildman SA and Crippen GM. 1999 J. Chem. Inf. Model.

0.88
Log Po/w (MLOGP)?

MLOGP: Topological method implemented from
Moriguchi I. et al. 1992 Chem. Pharm. Bull.
Moriguchi I. et al. 1994 Chem. Pharm. Bull.
Lipinski PA. et al. 2001 Adv. Drug. Deliv. Rev.

0.43
Log Po/w (SILICOS-IT)?

SILICOS-IT: Hybrid fragmental/topological method calculated by
FILTER-IT program, version 1.0.2, courtesy of SILICOS-IT, http://www.silicos-it.com

0.45
Consensus Log Po/w?

Consensus Log Po/w: Average of all five predictions

0.74

Water Solubility

Log S (ESOL):?

ESOL: Topological method implemented from
Delaney JS. 2004 J. Chem. Inf. Model.

-1.91
Solubility 2.54 mg/ml ; 0.0124 mol/l
Class?

Solubility class: Log S scale
Insoluble < -10 < Poorly < -6 < Moderately < -4 < Soluble < -2 Very < 0 < Highly

Very soluble
Log S (Ali)?

Ali: Topological method implemented from
Ali J. et al. 2012 J. Chem. Inf. Model.

-1.52
Solubility 6.22 mg/ml ; 0.0303 mol/l
Class?

Solubility class: Log S scale
Insoluble < -10 < Poorly < -6 < Moderately < -4 < Soluble < -2 Very < 0 < Highly

Very soluble
Log S (SILICOS-IT)?

SILICOS-IT: Fragmental method calculated by
FILTER-IT program, version 1.0.2, courtesy of SILICOS-IT, http://www.silicos-it.com

-1.03
Solubility 19.2 mg/ml ; 0.0935 mol/l
Class?

Solubility class: Log S scale
Insoluble < -10 < Poorly < -6 < Moderately < -4 < Soluble < -2 Very < 0 < Highly

Soluble

Pharmacokinetics

GI absorption?

Gatrointestinal absorption: according to the white of the BOILED-Egg

High
BBB permeant?

BBB permeation: according to the yolk of the BOILED-Egg

Yes
P-gp substrate?

P-glycoprotein substrate: SVM model built on 1033 molecules (training set)
and tested on 415 molecules (test set)
10-fold CV: ACC=0.72 / AUC=0.77
External: ACC=0.88 / AUC=0.94

No
CYP1A2 inhibitor?

Cytochrome P450 1A2 inhibitor: SVM model built on 9145 molecules (training set)
and tested on 3000 molecules (test set)
10-fold CV: ACC=0.83 / AUC=0.90
External: ACC=0.84 / AUC=0.91

No
CYP2C19 inhibitor?

Cytochrome P450 2C19 inhibitor: SVM model built on 9272 molecules (training set)
and tested on 3000 molecules (test set)
10-fold CV: ACC=0.80 / AUC=0.86
External: ACC=0.80 / AUC=0.87

No
CYP2C9 inhibitor?

Cytochrome P450 2C9 inhibitor: SVM model built on 5940 molecules (training set)
and tested on 2075 molecules (test set)
10-fold CV: ACC=0.78 / AUC=0.85
External: ACC=0.71 / AUC=0.81

No
CYP2D6 inhibitor?

Cytochrome P450 2D6 inhibitor: SVM model built on 3664 molecules (training set)
and tested on 1068 molecules (test set)
10-fold CV: ACC=0.79 / AUC=0.85
External: ACC=0.81 / AUC=0.87

No
CYP3A4 inhibitor?

Cytochrome P450 3A4 inhibitor: SVM model built on 7518 molecules (training set)
and tested on 2579 molecules (test set)
10-fold CV: ACC=0.77 / AUC=0.85
External: ACC=0.78 / AUC=0.86

No
Log Kp (skin permeation)?

Skin permeation: QSPR model implemented from
Potts RO and Guy RH. 1992 Pharm. Res.

-7.0 cm/s

Druglikeness

Lipinski?

Lipinski (Pfizer) filter: implemented from
Lipinski CA. et al. 2001 Adv. Drug Deliv. Rev.
MW ≤ 500
MLOGP ≤ 4.15
N or O ≤ 10
NH or OH ≤ 5

0.0
Ghose?

Ghose filter: implemented from
Ghose AK. et al. 1999 J. Comb. Chem.
160 ≤ MW ≤ 480
-0.4 ≤ WLOGP ≤ 5.6
40 ≤ MR ≤ 130
20 ≤ atoms ≤ 70

None
Veber?

Veber (GSK) filter: implemented from
Veber DF. et al. 2002 J. Med. Chem.
Rotatable bonds ≤ 10
TPSA ≤ 140

0.0
Egan?

Egan (Pharmacia) filter: implemented from
Egan WJ. et al. 2000 J. Med. Chem.
WLOGP ≤ 5.88
TPSA ≤ 131.6

0.0
Muegge?

Muegge (Bayer) filter: implemented from
Muegge I. et al. 2001 J. Med. Chem.
200 ≤ MW ≤ 600
-2 ≤ XLOGP ≤ 5
TPSA ≤ 150
Num. rings ≤ 7
Num. carbon > 4
Num. heteroatoms > 1
Num. rotatable bonds ≤ 15
H-bond acc. ≤ 10
H-bond don. ≤ 5

0.0
Bioavailability Score?

Abbott Bioavailability Score: Probability of F > 10% in rat
implemented from
Martin YC. 2005 J. Med. Chem.

0.56

Medicinal Chemistry

PAINS?

Pan Assay Interference Structures: implemented from
Baell JB. & Holloway GA. 2010 J. Med. Chem.

0.0 alert
Brenk?

Structural Alert: implemented from
Brenk R. et al. 2008 ChemMedChem

0.0 alert: heavy_metal
Leadlikeness?

Leadlikeness: implemented from
Teague SJ. 1999 Angew. Chem. Int. Ed.
250 ≤ MW ≤ 350
XLOGP ≤ 3.5
Num. rotatable bonds ≤ 7

No; 1 violation:MW<1.0
Synthetic accessibility?

Synthetic accessibility score: from 1 (very easy) to 10 (very difficult)
based on 1024 fragmental contributions (FP2) modulated by size and complexity penaties,
trained on 12'782'590 molecules and tested on 40 external molecules (r2 = 0.94)

1.55

Application In Synthesis of [ 84547-84-2 ]

* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.

  • Downstream synthetic route of [ 84547-84-2 ]

[ 84547-84-2 ] Synthesis Path-Downstream   1~32

  • 1
  • [ 15803-02-8 ]
  • [ 591-51-5 ]
  • [ 84547-84-2 ]
  • 11
  • [ 84547-84-2 ]
  • [ 84547-89-7 ]
YieldReaction ConditionsOperation in experiment
15 g With sulfuric acid; nitric acid; at 20 - 50℃; for 32.0h;Cooling with ice; Compound 22 (20 g) was dissolved in 100 mL of concentrated sulfuric acid.33 mL of concentrated nitric acid was slowly added dropwise in an ice water bath.After reacting for 16 h at room temperature, TLC showed a large amount of substrate remaining.After heating to 50 ° C for 16 h, the substrate substantially disappeared.After cooling, the reaction solution was slowly added dropwise to 1 L of ice water.Extract with ethyl acetate and wash the organic phase several times with water until pH = 7.After concentration, column chromatography gave yellowSolid 23 (15 g).
YieldReaction ConditionsOperation in experiment
N-methyl-4-bromopyrazole-3-carboxylic acid was prepared according to known methods, see: Yu. A. M.; Andreeva, M. A.; Perevalov, V. P.; Stepanov, V. I.; Dubrovskaya, V. A.; and Seraya, V. I. in Zh. Obs. Khim. (Journal of General Chemistry of the USSR) 1982, 52, 2592, and refs cited therein.
  • 16
  • [ 84547-84-2 ]
  • [ 124-40-3 ]
  • [ 473732-07-9 ]
YieldReaction ConditionsOperation in experiment
48% With N-ethyl-N,N-diisopropylamine; bromo-tris(1-pyrrolidinyl)phosphonium hexafluorophosphate; In tetrahydrofuran; DMF (N,N-dimethyl-formamide); at 25℃; for 26.0h; To a solution of N-METHYL4-BRORNOPYRAZOLE-3-CARBOXYLIC ACID (2.0 g), available from step A, in 65 mL of anhydrous DMF was added BROMOTRIPYRROLIDINOPHOSPHONIUM HEXAFLUOROPHOSPHATE (PyBrop, 4.60 g), dimethyl amine (10 mL, 2.0 M in THF) and DIISOPROPYLETHYL amine (5.2 mL) at 25 C. The mixture was stirred for 26 h, and concentrated under reduced pressure to an oily residue. This residue was treated with a 1.0 M NAOH aqueous solution, and extracted with ethyl acetate (50 mL x 4). The organic extracts were combined, washed with brine, and dried with anhydrous NA2SO4. Removal of solvents yielded an oil, which was purified by preparative thin layer chromatography, eluting with CH2CI2-MeOH (20: 1), to give 1.09 g of the amide product (48%, MH+ = 232.0).
48% To a solution of N-methyl-4-bromopyrazole-3-car-boxylic acid (2.0 g), available from step A, in 65 mL of anhydrous DMF was added bromotripyrrolidinophospho-nium hexafluorophosphate (PyBrop, 4.60 g), dimethyl amine (10 mL, 2.0 M in THF) and diisopropylethyl amine (5.2 mL) at 25 C. The mixture was stirred for 26 h, and concentrated under reduced pressure to an oily residue. This residue was treated with a 1.0 M NaOH aqueous solution, and extracted with ethyl acetate (50 mLx4). The organic extracts were combined, washed with brine, and dried with anhydrous Na2SO4. Removal of solvents yielded an oil, which was purified by preparative thin layer chromatogra-phy, eluting with CH2Cl2-MeOH (20:1), to give 1.09 g of the amide product (48%, MH+=232.0).
48% Step B; To a solution of <strong>[84547-84-2]N-methyl-4-bromopyrazole-3-carboxylic acid</strong> (2.0 g), available from step A, in 65 mL of anhydrous DMF was added bromotripyrrolidinophosphonium hexafluorophosphate (PyBrop, 4.60 g), dimethyl amine (10 mL, 2.0 M in THF) and diisopropylethyl amine (5.2 mL) at 25 C. The mixture was stirred for 26 h, and concentrated under reduced pressure to an oily residue. This residue was treated with a 1.0 M NaOH aqueous solution, and extracted with ethyl acetate (50 mL x 4). The organic extracts were combined, washed with brine, and dried with anhydrous Na2SO4. Removal of solvents yielded an oil, which was purified by preparative thin layer chromatography, eluting with CH2CI2-MeOH (20: 1), to give 1.09 g of the amide product (48%, MH+ = 232.0).
48% With N-ethyl-N,N-diisopropylamine; bromo-tris(1-pyrrolidinyl)phosphonium hexafluorophosphate; In tetrahydrofuran; DMF (N,N-dimethyl-formamide); at 25℃; for 26.0h; To a solution of <strong>[84547-84-2]N-methyl-4-bromopyrazole-3-carboxylic acid</strong> (2.0 g), available from step A, in 65 mL of anhydrous DMF was added bromotripyrrolidinophosphonium hexafluorophosphate (PyBrop, 4.60 g), dimethyl amine (10 mL, 2.0 M in THF) and diisopropylethyl amine (5.2 mL) at 25 C. The mixture was stirred for 26 h, and concentrated under reduced pressure to an oily residue. This residue was treated with a 1.0 M NaOH aqueous solution, and extracted with ethyl acetate (50 mL x 4). The organic extracts were combined, washed with brine, and dried with anhydrous Na2SO4. Removal of solvents yielded an oil, which was purified by preparative thin layer chromatography, eluting with CH2CI2-MeOH (20: 1), to give 1.09 g of the amide product (48%, MH+ = 232.0).

  • 17
  • [ 84547-84-2 ]
  • [ 473732-07-9 ]
YieldReaction ConditionsOperation in experiment
48% With bromotripyrrolidinophosphonium hexafluorophosphate; dimethyl amine; N-ethyl-N,N-diisopropylamine; In DMF (N,N-dimethyl-formamide); at 25℃; for 26.0h; To a solution of <strong>[84547-84-2]N-methyl-4-bromopyrazole-3-carboxylic acid</strong> (2.0 g), available from step A, in 65 mL of anhydrous DMF was added bromotripyrrolidinophosphonium hexafluorophosphate (PyBrop, 4.60 g), dimethyl amine (10 mL, 2.0 M in THF) and diisopropylethyl amine (5.2 mL) at 25 C. The mixture was stirred for 26 h, and concentrated under reduced pressure to an oily residue. This residue was treated with a 1.0 M NaOH aqueous solution, and extracted with ethyl acetate (50 mL?4). The organic extracts were combined, washed with brine, and dried with anhydrous Na2SO4. Removal of solvents yielded an oil, which was purified by preparative thin layer chromatography, eluting with CH2Cl2-MeOH (20:1), to give 1.09 g of the amide product (48%, MH+=232.0).
  • 18
  • [ 13808-64-5 ]
  • [ 84547-84-2 ]
YieldReaction ConditionsOperation in experiment
PREPARATIVE EXAMPLE 15; Step A; N-methyl-4-bromopyrazole-3-carboxylic acid was prepared according to known methods, see: Yu. A. M.; Andreeva, M. A.; Perevalov, V. P.; Stepanov, V. I. ; Dubrovskaya, V. A.; and Seraya, V. l. in Zh. Obs. Khim, (Journal of General Chemistry of the USSR) 1982,52, 2592 (and the references cited therein) the disclosure of whichis incorporated hereinby reference thereto.
  • 19
  • [ 67-56-1 ]
  • [ 84547-84-2 ]
  • [ 514816-42-3 ]
YieldReaction ConditionsOperation in experiment
65.4% With thionyl chloride; for 18.0h;Reflux; <strong>[84547-84-2]4-Bromo-2-methyl-2H-pyrazole-3-carboxylic acid</strong> (6 g, 29.3 mmol) was added to 150 mL of methanol treated with thionyl chloride (3.5 g, 29.3 mmol). The mixture was refluxed for 18 firs. Solvents were evaporated and the residue was extracted with dichloromethane and 0.5N sodium hydroxide solution. The organic layer was washed with brine and dried. After the evaporation of solvents, a white solid (4.19 g, 65.4percent yield) was obtained as the desired compound 4-bromo-2- methyl-2H-pyrazole-3-carboxylic acid methyl ester. 1H NMR (400 MHz, CDC13) delta ppm 3.97 (s, 3H), 4.19 (s, 3H), 7.51 (s, 1H). The aqueous extraction was filtered and neutralized with IN hydrochloric acid. The white solid was filtered and dried to give the unreacted starting material carboxylic acid (1.51 g).
63% Part A. <strong>[84547-84-2]4-bromo-2-methyl-2H-pyrazole-3-carboxylic acid</strong> methyl ester To the suspension of <strong>[84547-84-2]4-Bromo-2-methyl-2H-pyrazole-3-carboxylic acid</strong> (0.205 g, 1 mmol) in methanol (2 mL) was added thionyl chloride (0.29 mL, 4 mmol). The suspension was heated at 90° C. for 18 h to give a clear solution. The solution was cooled to rt and then concentrated. The residue was dissolved in EtOAc (10 mL), and washed with sat. NaHCO3, brine, dried over Na2SO4, filtered and concentrated to give 0.137 g (63percent) of the methyl ester as a white solid. 1H NMR (400 MHz, CDCl3) delta: 3.95 (s, 3H), 4.17 (s, 3H), 7.53 (s, 1H). HRMS calc'd for C6H8BrN2O2: 218.9769. Found: 218.9770.
  • 20
  • [ 84547-84-2 ]
  • [ 1350323-53-3 ]
  • 21
  • [ 84547-84-2 ]
  • [ 1350323-54-4 ]
  • 22
  • [ 84547-84-2 ]
  • C5H6BrN3O [ No CAS ]
YieldReaction ConditionsOperation in experiment
With ammonium chloride; O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate; N-ethyl-N,N-diisopropylamine; In N,N-dimethyl-formamide; at 20℃; for 0.166667h; Example 434-{3-[(1S)-1-(2-Chloro-3-fluoro-6-methoxyphenyl)ethyl]-1H-pyrrolo[2,3-b]pyridin-5-yl}-1-methyl-1H-pyrazole-5-carboxamideA mixture of <strong>[84547-84-2]4-bromo-2-methyl-2H-pyrazole-3-carboxylic acid</strong> (20.0 mg, 0.0976 mmol), NH4Cl (52.2 mg, 0.976 mmol), TBTU (62.6 mg, 0.195 mmol), DIPEA (0.170 mL, 0.976 mmol) and DMF (2 mL, 20 mmol) was stirred at rt for 10 min.The material was extracted with EtOAc, and washed with sat. NaHCO3 (3*) to remove carboxylic acid starting material.The organic layer was concentrated in vacuo. 3-[(S)-1-(2-Chloro-3-fluoro-6-methoxyphenyl)-ethyl]-5-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-1H-pyrrolo[2,3-b]pyridine (15.0 mg, 0.0348 mmol), (1,1'bis-(diphenylphosphino)-ferrocene) palladium dichloride (3.57 mg, 0.00488 mmol), K2CO3 (20.2 mg, 0.146 mmol) and 4:1 dioxane:H2O (1 mL, 10 mmol) were added, and the mixture was heated to 95° C. for 30 min.The solution was used directly for HPLC purification, and the fractions containing the pure product were concentrated in vacuo to afford the title compound as a white solid. 1H NMR (400 MHz, CD3OD): delta=1.79 (d, J=7.3 Hz, 3H), 3.70 (br. s., 3H), 3.99 (s, 3H), 5.09-5.16 (m, 1H), 6.90 (dd, J=9.2, 4.2 Hz, 1H), 7.08 (t, J=8.8 Hz, 1H), 7.34 (s, 1H), 7.50 (s, 1H), 7.59 (br. s., 1H), 8.20 (br. s., 1H). MS (ES+): m/z=428.11/430.12 (100/50) [MH+]. HPLC: tR=1.34 min (polar-3 min, UPLC-ACQUITY).
  • 23
  • [ 84547-84-2 ]
  • [ 1276056-83-7 ]
YieldReaction ConditionsOperation in experiment
92% With borane-THF; In tetrahydrofuran; at 80℃; for 12.0h;Inert atmosphere; A mixture of 4-bromo- 1 -methyl - 1 //-pyrazole-5-carboxylic acid (4.80 g, 23.4 mmol, CAS 84547-84-2) in THF (40.00 mL) was added BH3/THF (93.60 mL, 1 M). The mixture was stirred at 80 C for 12 hours under N2 atmosphere. To the mixture was added EtOAc (200 mL). The mixture was washed with saturated NaHCO, (200 mL x 3). The organic layer was dried over anhydrous Na2S04, filtered and concentrated to give a residue. The residue was purified by column chromatography (petroleum ether : ethyl acetate = 100 : 0 to 100 : 10) to give (4-bromo-l -methyl- li-pyrazol-5-yl)methanol (4.10 g, 92% yield) as a white solid. 1HNMR (400 MHz, DMSO-6): d 7.26 (s, 1H), 4.62 (s, 2H), 3.86 (s, 3H).
77% With borane-THF; In tetrahydrofuran; at 50℃; for 48.0h; A mixture of 4-bromo- 1 -methyl- 1 H-pyrazole-5-carboxylic acid (5.0 g, 24.4 mmol) and BH3.THF (36.6 mL of a 1 M solution in THF, 36.6 mmol) in THF (50 mL) was stirred at 50 C for 2 days; at this point LCMS showed the completion of the reaction. The reaction was cooled to RT and cautiously quenched with aq. 1N HC1 and stirred at RT for 1 h, after which the mixture was extracted with EtOAc (3 X 50 mL). The combined organic extracts were concentrated in vacuo. The residue was chromato graphed (80 g Si02; continuous gradient from 0% to 100% EtOAc in hexanes, 25 min) to give the title compound (3.60 g, 18.9 mmol, 77 % yield) as a white solid. LCMS, [M+H]+ = 193.0.
77% With borane-THF; In tetrahydrofuran; at 50℃; for 48.0h;Inert atmosphere; A mixture of 4-bromo- 1 -methyl- 1 H-pyrazole-5-carboxylic acid (5.0 g, 24.4 mmol) and BH3.THF (36.6 mL of a 1 M solution in THF, 36.6 mmol) in THF (50 mL) was stirred at 50 C for 2 days; at this point LCMS showed the completion of the reaction. The reaction was cooled to RT and cautiously quenched with aq. IN HC1 and stirred at RT for 1 h, after which the mixture was extracted with EtOAc (3 X 50 mL). The combined organic extracts were concentrated in vacuo. The residue was chromatographed (80 g Si02; continuous gradient from 0% to 100% EtOAc in hexanes, 25 min) to give the title compound (3.60 g, 18.9 mmol, 77 % yield) as a white solid. LCMS, [M+H]+ = 193.0.
77% With borane-THF; In tetrahydrofuran; at 50℃; for 48.0h; A mixture of 4-bromo-l-methyl-lH-pyrazole-5-carboxylic acid (5.0 g, 24.4 mmol) and BH3.THF (36.6 mL of a 1 M solution in THF, 36.6 mmol) in THF (50 mL) was stirred at 50 C for 2 days; at this point LCMS showed the completion of the reaction. The reaction was cooled to RT and cautiously quenched with aq. 1N F1C1 and stirred at RT for 1 h, after which the mixture was extracted with EtOAc (3 X 50 mL). The combined organic extracts were concentrated in vacuo. The residue was (0667) chromatographed (80 g S1O2; continuous gradient from 0% to 100% EtOAc in hexanes, 25 min) to give the title compound (3.60 g, 18.9 mmol, 77 % yield) as a white solid. LCMS, [M+H]+ = 193.0.
Example 44 (4-{3-[(1S)-1-(2-Chloro-3-fluoro-6-methoxyphenyl)ethyl]-1H-pyrrolo[2,3-b]pyridin-5-yl}-1-methyl-1H-pyrazol-5-yl)methanol To a solution of <strong>[84547-84-2]4-bromo-2-methyl-2H-pyrazole-3-carboxylic acid</strong> (20.0 mg, 0.0976 mmol) in THF (3 mL, 40 mmol) was added 1.0 M of BH3.THF in THF (0.49 mL, 0.49 mmol), and the resulting solution was heated to 60 C. overnight. The material was extracted with EtOAc, and washed with sat. NaHCO3 (3*) to remove carboxylic acid starting material. The organic layer was concentrated in vacuo. 3-[(S)-1-(2-Chloro-3-fluoro-6-methoxyphenyl)-ethyl]-5-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-1H-pyrrolo[2,3-b]pyridine (15.0 mg, 0.0348 mmol), (1,1'bis-(diphenylphosphino)-ferrocene) palladium dichloride (3.57 mg, 0.00488 mmol), K2CO3 (20.2 mg, 0.146 mmol) and 4:1 dioxane:H2O (1 mL, 10 mmol) were added, and the mixture was heated to 95 C. for 30 min. The solution was used directly for HPLC purification, and the fractions containing the pure product were concentrated in vacuo to afford the title compound as a white solid. 1H NMR (400 MHz, CD3OD): delta=1.80 (d, J=7.1 Hz, 3H), 3.67 (br. s., 3H), 3.96 (s, 3H), 4.55 (s, 2H), 5.08-5.17 (m, 1H), 6.90 (dd, J=9.1, 4.3 Hz, 1H), 7.08 (t, J=8.8 Hz, 1H), 7.34 (d, J=1.3 Hz, 1H), 7.46 (s, 1H), 7.53 (s, 1H), 8.15-8.22 (m, 1H). MS (ES+): m/z=415.13/417.13 (100/50) [MH+]. HPLC: tR=1.37 min (polar-3 min, UPLC-ACQUITY).
With borane-THF; In tetrahydrofuran; at 20 - 50℃; for 73.0h; To a RT solution of 4-bromo-l -methyl- lH-pyrazole-5-carboxylic acid (2.0 g, 9.8 mmol) in THF (24.4 ml) was added BH3.THF complex (19.5 mL of a 1M solution in TFIF, 19.5 mmol) and the reaction was stirred at RT for 1 h, then was heated to 50 C and stirred at 50 C for 3 days, then was cooled to RT. The reaction was quenched slowly by dropwise addition of 1M aq. HC1 (10 mL) at RT, then was partitioned between CH2Cl2 (30 mL) and water (30 mL). The aqueous phase was extracted with CFLCh (2 X 30 mL) and the combined organic extracts were dried (MgS04) and filtered through a pad of Si02 to give the crude title compound (1.86 g, 100 % yield) as a white solid. LCMS, [M + H]+ = 191.0, 193.0.

  • 24
  • [ 84547-84-2 ]
  • [ 75-65-0 ]
  • [ 1380587-83-6 ]
YieldReaction ConditionsOperation in experiment
<strong>[84547-84-2]4-Bromo-2-methyl-2H-pyrazole-3-carboxylic acid</strong> (2 g, 9.76 mmol) and triethylamine (1.50 mL, 10.73 mmol) were combined in toluene (10 mL).Diphenylphosphoryl azide (2.31 mL, 10.73 mmol) was added and the reaction stirred at room temperature for 3 hours . tert-Butanol (1.12 mL, 11.71 mmol) was added and the reaction was stirred at 60 °C overnight. After cooling the ?-BuOH was removed under vacuum and the reaction was submitted to EtOAc/ELO workup. The crude material was purified via silica gel chromatography (0-100percent EtOAc in hexanes) to give the title compound.
  • 25
  • [ 84547-84-2 ]
  • [ 1517-69-7 ]
  • [ 1396007-83-2 ]
YieldReaction ConditionsOperation in experiment
With diphenyl phosphoryl azide; triethylamine; In toluene; at 80℃; for 1.0h; <strong>[84547-84-2]4-Bromo-2-methyl-2H-pyrazole-3-carboxylic acid</strong> (787.2 mg, 3.84 mmol), DPPA (1.16 g, 4.22 mmol), (R)-l-phenylethanol (491 mg, 4.02 mmol) and TEA (1.10 mL, 7.68 mmol) were combined in 15 mL of toluene to give a clear solution. The mixture was heated to 80 °C and stirred for 1 fir. Solvents were evaporated and the residue was extracted with ethyl acetate and sodium bicarbonate solution. The organic layer was dried and evaporated to give an oily material (1.38 g). TLC indicated no UV absorption. 1H-NMR of the crude material indicated 75percent desired compound as 4-bromo-2-methyl-2H-pyrazol-3-yl-carbamic acid (R)-l-phenyl-ethyl ester. LRMS calcd for Ci3Hi4BrN302 (m/e) 324.0, obsd 323.0 (M-H, ES-).
  • 26
  • [ 84547-84-2 ]
  • [ 142598-53-6 ]
  • 27
  • [ 84547-84-2 ]
  • 4-(4-fluorophenyl)-2-methyl-2H-pyrazol-3-carboxylic acid methyl ester [ No CAS ]
  • 28
  • [ 84547-84-2 ]
  • [ 483315-65-7 ]
  • 29
  • [ 84547-84-2 ]
  • [ 23097-85-0 ]
  • 30
  • [ 15803-02-8 ]
  • [ 124-38-9 ]
  • [ 84547-84-2 ]
YieldReaction ConditionsOperation in experiment
77.3 g With n-butyllithium; diisopropylamine; In tetrahydrofuran; acetone; at -78 - 0℃; for 1.0h;Inert atmosphere; tHF (anhydrous) 600 ml was added to a 2 L reaction flask.Diisopropylamine 65.4g,Argon replacement protection,Dry ice acetone was cooled to -78 °C. Add 2.5M n-butyl lithium 258ml,The temperature is raised at 0 ° C for 0.5 h, and the temperature is lowered to -78 ° C.80.0 g of 1-methyl-4-bromopyrazole was added dropwise, and the reaction was maintained at -78 ° C for 1 h.Pass dry carbon dioxide gas until the reaction is complete.TLC showed the reaction was complete, and 1N HCl was added dropwise to adjust pH = 2-3.A large amount of white solid precipitated. After cooling at 0 ° C for 3 h, filter.Drying at 40 ° C for 16 h gave a white solid compound 22 (77.3 g).
  • 31
  • [ 84547-84-2 ]
  • C6H6BrN3O4 [ No CAS ]
  • 32
  • [ 84547-84-2 ]
  • C8H9N3O4 [ No CAS ]
 

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Technical Information

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