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[ CAS No. 1522-92-5 ] {[proInfo.proName]}

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Chemical Structure| 1522-92-5
Chemical Structure| 1522-92-5
Structure of 1522-92-5 * Storage: {[proInfo.prStorage]}

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Product Citations

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Flavio S.P. Cardoso ; Appasaheb L. Kadam ; Ryan C. Nelson , et al. DOI: PubMed ID:

Abstract: A low-cost, protecting group-free route to 6-(2-fluoro-4-nitrophenyl)-2-oxa-6-azaspiro[3.3]heptane (1), the starting material for the in-development tuberculosis treatment TBI-223, is described. The key bond forming step in this route is the creation of the azetidine ring through a hydroxide-facilitated alkylation of 2-fluoro-4-nitroaniline (2) with 3,3-bis(bromomethyl)oxetane (BBMO, 3). After optimization, this ring formation reaction was demonstrated at 100 g scale with isolated yield of 87% and final product purity of >99%. The alkylating agent 3 was synthesized using an optimized procedure that starts from tribromoneopentyl alcohol (TBNPA, 4), a commercially available flame retardant. Treatment of 4 with sodium hydroxide under Schotten–Baumann conditions closed the oxetane ring, and after distillation, 3 was recovered in 72% yield and >95% purity. This new approach to compound 1 avoids the previous drawbacks associated with the synthesis of 2-oxa-6-azaspiro[3,3]heptane (5), the major cost driver used in previous routes to TBI-223. The optimization and multigram scale-up results for this new route are reported herein.

Keywords: tuberculosis ; TBI-223 ; azaspiro[3.3]heptane ; spiroamine

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Product Details of [ 1522-92-5 ]

CAS No. :1522-92-5 MDL No. :MFCD00021982
Formula : C5H9Br3O Boiling Point : -
Linear Structure Formula :- InChI Key :QEJPOEGPNIVDMK-UHFFFAOYSA-N
M.W : 324.84 Pubchem ID :15206
Synonyms :

Calculated chemistry of [ 1522-92-5 ]      Expand+

Physicochemical Properties

Num. heavy atoms : 9
Num. arom. heavy atoms : 0
Fraction Csp3 : 1.0
Num. rotatable bonds : 4
Num. H-bond acceptors : 1.0
Num. H-bond donors : 1.0
Molar Refractivity : 50.66
TPSA : 20.23 ?2

Pharmacokinetics

GI absorption : High
BBB permeant : Yes
P-gp substrate : No
CYP1A2 inhibitor : No
CYP2C19 inhibitor : No
CYP2C9 inhibitor : No
CYP2D6 inhibitor : No
CYP3A4 inhibitor : No
Log Kp (skin permeation) : -6.51 cm/s

Lipophilicity

Log Po/w (iLOGP) : 2.08
Log Po/w (XLOGP3) : 2.5
Log Po/w (WLOGP) : 2.15
Log Po/w (MLOGP) : 2.69
Log Po/w (SILICOS-IT) : 2.55
Consensus Log Po/w : 2.39

Druglikeness

Lipinski : 0.0
Ghose : None
Veber : 0.0
Egan : 0.0
Muegge : 1.0
Bioavailability Score : 0.55

Water Solubility

Log S (ESOL) : -3.16
Solubility : 0.222 mg/ml ; 0.000684 mol/l
Class : Soluble
Log S (Ali) : -2.57
Solubility : 0.874 mg/ml ; 0.00269 mol/l
Class : Soluble
Log S (SILICOS-IT) : -3.5
Solubility : 0.102 mg/ml ; 0.000313 mol/l
Class : Soluble

Medicinal Chemistry

PAINS : 0.0 alert
Brenk : 1.0 alert
Leadlikeness : 0.0
Synthetic accessibility : 2.57

Safety of [ 1522-92-5 ]

Signal Word:Warning Class:N/A
Precautionary Statements:P501-P261-P270-P271-P264-P280-P337+P313-P305+P351+P338-P362+P364-P332+P313-P301+P312+P330-P302+P352+P312-P304+P340+P312 UN#:N/A
Hazard Statements:H302+H312+H332-H315-H319 Packing Group:N/A
GHS Pictogram:
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