Phenethyl bromide → (1R,7S)-4-(2,4-difluorophenyl)-1,10,10-trimethyl-3-(2-phenylethyl)-3,4-diazatricyclo[5.2.1.02,6]dec-2(6)-en-5-one

Participants

Reaction Conditions

Reaction Steps

A mixture of (2-bromoethyl)benzene (200 μL, 1.46 mmol), (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 14; 100 mg, 0.33 mmol) and tetra-n-butylammonium iodide (94 mg, 0.25 mmol) in N,N-dimethylformamide (1 mL) was heated in a pressure tube in an oil-bath at 100° C. for 18 h. Additional portions of (2-bromoethyl)benzene (200 μL, 2.2 mmol) and tetra-n-butylammonium iodide (100 mg, 0.27 mmol) were added and the reaction mixture was heated at 100° C. for 3 days, and then allowed to stand overnight at room temperature. The reaction mixture was diluted with dichloromethane (100 mL), washed with water (5×25 mL) and sodium thiosulfate solution (25 mL), dried (magnesium sulfate), filtered, and evaporated and the residue was purified on an Isco 40 g column, eluting with 40-100% ethyl acetate/hexanes to give (4S,7R)-2-(2,4-difluoro-phenyl)-7,8,8-trimethyl-1-phenethyl-1,2,4,5,6,7-hexahydro-4,7-methano-indazol-3-one (37 mg, 28%) as a pale yellow oil that solidified on standing. ES(+)-MS (M+H) 409.

Provenance & Evidence