Hydrochloric Acid → HCID 68283128, compound

Participants

Reaction Steps

To a diastreoisomeric mixture of (1R,3S,5S) and (1S,3S,5R)-5-hydroxymethyl-2-aza-bicyclo[3.1.0]hexane-2,3-dicarboxylic acid 2-tert-butyl ester (312 mg, 1.21 mmol), 3-chloro-2-fluorobenzylamine (232 mg, 1.46 mmol), HBTU (690 mg, 1.82 mmol) in CH2Cl2 (6 mL) was added DIPEA (0.623 mL, 3.64 mmol). The resulting solution was stirred at RT under nitrogen overnight. DIPEA (0.21 mL, 1.21 mmol), HBTU (230 mg, 0.6 mmol) and 3-chloro-2-fluorobenzylamine (97 mg, 0.606 mmol) were added and the mixture was further stirred overnight at RT under N2. The mixture was poured into an aqueous solution of HCl 1N (pH-1) and extracted with CH2Cl2 (2×). The combined organic layers were washed with brine, dried (Na2SO4), filtered and concentrated. The crude residue was purified by flash column chromatography on silica gel (c-hexane to c-hexane/EtOAc 40:60) to give (1S,3S,5R)-3-(3-chloro-2-fluoro-benzylcarbamoyl)-5-hydroxymethyl-2-aza-bicyclo[3.1.0]hexane-2-carboxylic acid tert-butyl ester: TLC, Rf (EtOAc)=0.55 (stained with ninhydrine); MS (UPLC-MS): 399.2/401.2 [M+H]+, 299.2/301.2 [MH−Boc]+, 343.2/345.2 [MH−tBu]+, 443.2/445.3 [M+HCOO]−; tR (HPLC conditions f): 1.95 min, and (1R,3S,5S)-3-(3-chloro-2-fluoro-benzylcarbamoyl)-5-hydroxymethyl-2-aza-bicyclo[3.1.0]hexane-2-carboxylic acid tert-butyl ester: TLC, Rf (EtOAc)=0.45 (stained with ninhydrine); MS (UPLC-MS): 399.2/401.2 [M+H]+, 299.2/301.2 [MH−Boc]+, 343.2/345.2 [MH−tBu]+, 443.2/445.3 [M+HCOO]−; tR (HPLC conditions f): 1.89 min.

Provenance & Evidence