Trifluoroacetic acid → HCID 59152454, compound

Participants

Reaction Steps

Dissolve [(R)-1-(5-bromo-pyridin-2-yl)-pyrrolidin-3-yl]-carbamic acid tert-butyl ester (4.24 g, 12.43 mmol) in CH2Cl2 (10 mL) and add TFA (5 mL). Stir at RT for 1 h. Evaporate the excess reagent. Dissolve the resulting crude material in CH2Cl2 (50 mL) and cool to 0° C. Add difluoroacetic acid (1.78 g, 18.64 mmol), EDCI (3.57 g, 18.64 mmol), HOBt (2.52 g, 18.64 mmol) and Et3N (5.2 mL, 37.3 mmol). Stir the reaction at 0° C. for 30 min and at RT overnight. Dilute with CH2Cl2 (100 mL) and wash with 0.1 M NaOH (2×50 mL) and H2O (100 mL). Dry the solution with Na2SO4, filter, and concentrate. Purify the crude material, eluting with 100% EtOAc to give 1.98 g (50%) of the title compound. MS/ES m/z (79Br) 321.0 [M+H]+.

Provenance & Evidence