Dimethyl Sulfate → HCID 57941330, compound

Participants

Reaction Steps

A mixture of dimethyl sulfate (1.1 mL, 11.6 mmol) and (4S,7R)-2-(4-fluoro-phenyl)-7,8,8-trimethyl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one (Intermediate 13; 1.65 g, 5.8 mmol) in 1 M NaOH (25 mL) was heated at 50 degrees overnight, and then allowed to stand at room temperature over the weekend. The precipitate was filtered off, washed with water, and recrystallized from ethyl acetate to give (4S,7R)-2-(4-fluoro-phenyl)-1,7,8,8-tetramethyl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one (239 mg, 14%) as a white solid. ES(+)-MS (M+H) 301.

Provenance & Evidence