Dimethyl Sulfoxide → 4-((s)-3-Tert-butoxycarbonylaminopyrrolidin-1-yl)-3-chloro-2-cyclopropylamino-5-fluorobenzoic acid ethyl ester

Participants

Reaction Steps

A solution of 4-[(S)-3-(tert-butoxycarbonylamino)pyrrolidin-1-yl]-3-chloro-2,5-difluorobenzoic acid ethyl ester (Example 2c, 9.34 g, 23.1 mmol), cyclopropylamine (16 mL, 228 mmol), and dimethyl sulfoxide (30 mL) is heated in a sealed tube at 110° C. for 3 days. After cooling to room temperature, the reaction mixture is diluted with ethyl acetate and washed with saturated NaHCO3, water, and brine. The organic layer is dried over MgSO4, filtered, and the filtrate is concentrated to afford a brown residue. The residue is then purified via flash column chromatography (1:1 ethyl acetate/hexanes) to afford the title compound (4.41 g). MS CI: m/z 442 (MH+).

Provenance & Evidence