Diisopropylethylamine → (1R,3S,5S)-3-(2-Fluoro-3-trifluoromethoxy-phenylcarbamoyl)-5-(tetrahydro-pyran-2-yloxymethyl)-2-aza-bicyclo[3.1.0]hexane-2-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of (1R,3S,5S)-5-(tetrahydro-pyran-2-yloxymethyl)-2-aza-bicyclo[3.1.0]hexane-2,3-dicarboxylic acid 2-tert-butyl ester (100 mg, 0.29 mmol) in dry CH2Cl2 (1 mL) under argon at 0° C. was added 1-chloro-N,N,2-trimethylpropenylamine (58 μL, 0.44 mmol) and the reaction mixture was stirred at 0° C. for 1.5 h. 2-Fluoro-3-(trifluoromethoxy)aniline (86 mg, 0.44 mmol) was added, followed by DIPEA (100 μL, 0.59 mmol) and the mixture was stirred at RT overnight. Then poured into water and extracted with CH2Cl2 (×2), the organics were dried (Na2SO4), filtered and concentrated. The crude residue was purified by flash column chromatography on silica gel (eluent: c-hexane to c-hexane/EtOAc 85:15). TLC, Rf (c-hexane/EtOAc 2:1)=0.45; MS (UPLC/MS): 519.3 [M+H]+, 536.3 [M+NH4]+, 517.4 [M−H]−, 563.3 [M−HCOO]−; tR (HPLC conditions f): 2.51 min.

Provenance & Evidence