Cyanogen Bromide → 1'-Cyano-1-(2-fluorophenyl)spiro[indoline-3,4'-piperidine]

Participants

Reaction Steps

A mixture of 0.82 g of 1-(2-fluorophenyl)-1'-methylspiro[indoline-3,4'-piperidine], free base of Example 10, 0.92 g of cyanogen bromide and 1.0 of potassium carbonate in 24 ml of methylene dichloride is stirred at ambient temperature for 5 hours and then an additional 0.20 g of cyanogen bromide is added. Stirring is continued for 16 hours before filtering the mixture. The filtrate is boiled with methyl alcohol and the hot solution is evaporated to dryness leaving a brown foam. This product is purified by passing through a silica gel column, ether methylene chloride (1:1) mixture eluant, to provide a tan solid. The solid is recrystallized from an acetone-hexane mixture to provide white needles (slight tan tint), mp 131°-132° C. of 1'-cyano-1-(2-fluorophenyl)spiro[indoline-3,4'-piperidine].

Provenance & Evidence