Methyl iodide → (4S,7R)-1,7,8,8-tetramethyl-2-naphthalen-1-yl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one

Participants

Reaction Conditions

Reaction Steps

A mixture of (4S,7R)-7,8,8-trimethyl-2-naphthalen-1-yl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one (Intermediate 46; 150 mg, 0.47 mmol) and iodomethane (118 μL, 1.88 mmol) in dimethylformamide (5 mL) was heated in an oil-bath at 100° C. for 8 h. The solvent was evaporated and the residue was partitioned between dichloromethane and water. The aqueous layer was extracted with dichloromethane (2×100 mL) and the combined organic layers were washed with water (5×100 mL) and aqueous sodium thiosulfate (100 mL). The solvent was evaporated and the residue was purified using an ISCO 40 g column, eluting with 70-90% ethyl acetate/hexanes to give (4S,7R)-1,7,8,8-tetramethyl-2-naphthalen-1-yl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one (54 mg, 35%) as a white solid. ES(+)-MS (M+H) 333.

Provenance & Evidence