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CAS No. : | 87611-00-5 | MDL No. : | MFCD09954883 |
Formula : | C8H3Cl2FN2 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | AXMYGHKVWFFYCR-UHFFFAOYSA-N |
M.W : | 217.03 | Pubchem ID : | 34176231 |
Synonyms : |
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Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | |
Hazard Statements: | H315-H319-H335 | Packing Group: | |
GHS Pictogram: |
* 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.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
80.8% | With 1,8-diazabicyclo[5.4.0]undec-7-ene; trichlorophosphate; In toluene; at 50 - 120℃; | B-1 (2.6 g, 14.43 mmol) was suspended in 29 mL of toluene and heated to 50 C. Phosphoryl chloride (9.88 mL, 108.25 mmol) was added dropwise, and then DBU (4.31 mL, 28.87 mmol) was added dropwise. The mixture was stirred vigorously at 120 C for overnight. After the reaction mixture was cooled at room temperature, it was added dropwise to ice-water. The aqueous layer was extracted with ethyl acetate. After it was washed with brine and dried with Na2S04, it was concentrated to give a solid. The crude product was purified by column chromatography on silica gel eluting with toluene to yield 3.41 g (80.8%) of B-2 as a white powder. It was used for next reaction without purification. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
45% | With dicyclohexyl-(2',6'-dimethoxybiphenyl-2-yl)-phosphane;palladium diacetate; In tetrahydrofuran; diethyl ether; at 45 - 48℃; for 40.0h;Inert atmosphere; | Preparation of tert-butyl 2-(2-chloro-5-fluoroquinazolin-4-yl)acetate To a solution of <strong>[87611-00-5]2,4-dichloro-5-fluoroquinazoline</strong> (1.88 g, 8.64 mmol, Accela ChemBio) in THF (21.6 mL) under a nitrogen atmosphere was added (2-tert-butoxy-2-oxoethyl)zinc(II) chloride (0.5 M solution in Et2O, 51.8 mL, 25.9 mmol, Rieke Metals). Nitrogen was bubbled through the solution for about 20 min. Palladium(II) acetate (0.097 g, 0.432 mmol) and 2-dicyclohexylphosphino-2',6'-dimethoxybiphenyl (0.355 g, 0.864 mmol) were added to the reaction, each in one portion, and nitrogen was bubbled through the solution for about 5 min. The reaction solution was warmed to about 45 C. for about 24 h. After allowing to cool to ambient temperature, (2-tert-butoxy-2-oxoethyl)zinc(II) chloride (0.5 M solution in Et2O, 20.0 mL, 10.0 mmol, Rieke Metals), Pd(OAc)2 (0.097 g, 0.432 mmol), and 2-dicyclohexylphosphino-2',6'-dimethoxybiphenyl (0.355 g, 0.864 mmol) were added respectively. Nitrogen was bubbled through the solution for about 20 min and the reaction was warmed to about 48 C. for about 16 h. After cooling to ambient temperature, saturated aqueous NaHCO3 (90 mL) and EtOAc (100 mL) were added. The solid was removed by filtration. The layers were separated and the aqueous phase was extracted with EtOAc (100 mL). The combined organics were dried over MgSO4, filtered, and concentrated under reduced pressure. The residue was purified by flash column chromatography on silica gel eluting with a gradient of 0-30% EtOAc in heptane. The product containing fractions were concentrated under reduced pressure and the residue was triturated with EtOAc. The solid was removed by filtration and the organics were concentrated under reduced pressure to afford tert-butyl 2-(2-chloro-5-fluoroquinazolin-4-yl)acetate (1.14 g, 45% yield): LC/MS (Table 1, method c) Rt=2.64 min; MS m/z: 297 (M+H)+. |
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