Dichloromethane → HCID 57941316, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of (4S,7R)-7,8,8-trimethyl-2-(2,2,2-trifluoro-ethyl)-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one (Intermediate 47; 150 mg, 0.55 mmol), tetrabutylammonium iodide (220 mg, 0.60 mmol) and benzyl bromide (580 μL, 4.9 mmol) in dimethylformamide (2 mL) was heated in a pressure tube in an oil-bath at 100° C. for 20 h. Dichloromethane (75 mL) was added and the solution was washed with water (5×25 mL) and aqueous sodium thiosulfate (25 mL), dried (magnesium sulfate), filtered, evaporated and purified using an ISCO 40 g column, eluting with 20-100% ethyl acetate/hexanes. Fractions homogeneous for the product were evaporated, co-evaporated with petroleum ether, triturated with petroleum ether, evaporated, and dried under high vacuum at 70° C. overnight to give (4S,7R)-1-benzyl-7,8,8-trimethyl-2-(2,2,2-trifluoro-ethyl)-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one (139 mg, 70%) as a white solid. ES(+)-MS (M+H) 365.

Provenance & Evidence