Hydrochloric Acid → HCID 45380876, compound

Participants

Reaction Steps

To a solution of 5-(2-chloro-4-fluorophenyl)-4-methyl-N-[4-(methylsulfonyl)phenyl]-1H-pyrrole-3-carboxamide (0.50 g, 1.2 mmol) in anhydrous DMA (8.0 ml) was added sodium tert-butoxide (0.27 g, 2.8 mmol) and stirred at room temperature for 30 min under N2. (4S,5S)-4,5-dimethyl-1,3,2-dioxathiolane 2,2-dioxide (0.28 g, 1.8 mmol) in anhydrous DMA (2.0 ml) was added to the solution and stirred at 70° C. for 2.0 h. The reaction mixture was cooled to room temperature and added 2N HCl (2.0 ml) and concentrated on a rotary evaporator. To this residue was added anhydrous THF (4.0 ml) and 5N HCl (5.0 ml) and stirred at 60° C. for 80 min. The mixture was diluted with ethyl acetate and washed with water, satd NaHCO3 and brine, then dried over sodium sulfate and concentrated on a rotary evaporator. The resulting residue was purified by silica-gel column chromatography (3:7 to 2:8 hexane:ethyl acetate) to give an atropisomeric mixture of the title compound (0.29 g, 50%) as a white solid.

Provenance & Evidence