Phenyl chloroformate → HCID 12694090, compound

Participants

Reaction Steps

To 5.0 g of phenyl chloroformate in 80 ml of dichloromethane is added 7.89 g of the free base, 3-(3-fluorophenyl)-1,3-dihydro-1'-methylspiro[benzo(c)thiophene-1,4'-piperidine] of Example 55, in 10 ml of dichloromethane over 20 minutes. The reaction mixture is stirred at room temperature for 21 hours, then diluted with 200 ml of dichloromethane. The resultant mixture is washed with two 175 ml portions of 10% aqueous sodium hydroxide solution, two 150 ml portions of water and one 70 ml portion of saturated aqueous sodium chloride solution, and dried over magnesium sulfate to give an oil. The oil is chromatographed on silica gel with dichloromethane to give an oil, which crystallizes to yield 3-(3-fluorophenyl)-1,3-dihydro-1'-phenoxycarbonylspiro[benzo(c)thiophene-1,4'-piperidine], m.p. 134°-142° C. A portion is recrystallized twice from toluene:hexane, m.p. 144°-146° C.

Provenance & Evidence