Dichloromethane → HCID 57941317, compound

Participants

Reaction Steps

A solution of (4R,7S)-2-(2,4-difluoro-phenyl)-7,8,8-trimethyl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one (Intermediate 42; 300 mg, 0.99 mmol), tetrabutylammonium iodide (270 mg, 0.7 mmol) and methyl 4-(bromomethyl)benzoate (1.00 g, 4.37 mmol) in dimethylformamide (10 mL) was heated at 100° C. for 3 h. The reaction mixture was allowed to cool. Dichloromethane (100 mL) was added, and the solution was washed with (5×25 mL), aqueous sodium thiosulfate (25 mL), and brine (25 mL), dried (magnesium sulfate, filtered, and evaporated. The residue was purified using an ISCO 40 g column, eluting with 50-100% ethyl acetate/hexanes. Fractions containing the product were concentrated and then dried under high vacuum at 50° C. give 4-[(4R,7S)-2-(2,4-difluoro-phenyl)-7,8,8-trimethyl-3-oxo-2,3,4,5,6,7-hexahydro-4,7-methano-indazol-1-ylmethyl]-benzoic acid methyl ester (219 mg, 49%) as a pale yellow solid. ES(+)-MS (M+H) 453.

Provenance & Evidence