2,2,2-Trichloroethyl chloroformate → (3RS,4SR)-3-(3,4-Dichloro-phenyl)-4-[(RS)-1-(4-trifluoromethyl-phenoxy)-ethyl]-pyrrolidine

Participants

Reaction Steps

To a solution of (3RS,4SR)-1-benzyl-3-(3,4-dichloro-phenyl)-4-[(RS)-1-(4-trifluoromethyl-phenoxy)-ethyl]-pyrrolidine (XI-B-1) 0.99 g (2.00 mmol) dissolved in CH3CN (25 mL) was added 0.40 mL (3.00 mmol) of 2,2,2-trichloroethyl chloroformate and stirring was continued for 4 hours at RT. Volatiles were removed under vacuo, and the crude was dissolved in AcOH (20 mL) before a total of 800 mg of Zn dust was added portion wise. After three hours at RT, the reaction mixture was filtered on celite, the solvent removed under vacuo, followed by extraction with EtOAc/aq. NaHCO3 (basic pH). The organic phases were dried on Na2SO4 and column chromatography (SiO2, CH2Cl2/MeOH 9:1) yielded 0.54 g (67%) of the title compound as a colorless oil. ES-MS m/e: 404.2 (M+H+).

Provenance & Evidence