Methyl iodide → HCID 57941467, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of (4S,7R)-2-(2,3-dimethyl-phenyl)-7,8,8-trimethyl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one (Intermediate 16; 4.07 g, 13.8 mmol) and iodomethane (1.5 mL, 24.1 mmol) in N,N-dimethylformamide (60 mL) in a sealed tube was heated to 105° C. and stirred for 1.5 h. The reaction mixture was allowed to cool and saturated sodium bicarbonate solution (200 mL) was added. A solid precipitated. Water (100 mL) was added, and the mixture was extracted with ethyl acetate (300 mL). The organic layer was washed with brine (300 mL), concentrated and purified by chromatography, eluting with 60-100% ethyl acetate/dichloromethane. Fractions containing the product were combined, evaporated, and recrystallized from ethyl acetate/hexanes to give (4S,7R)-2-(2,3-dimethyl-phenyl)-1,7,8,8-tetramethyl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one (2.12 g 49%) as a white solid. ES(+)-MS (M+H) 311.

Provenance & Evidence