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

Beteiligte Stoffe

Reaktionsschritte

A solution of 18.23 g of 1-(2-nitrophenyl)-1'-methylspiro[indoline-3,4'-piperidine] of Example 15 in 100 ml of chloroform is added dropwise over 50 minutes to a rapidly stirred slurry of 11.65 g of potassium carbonate and 8.94 g of cyanogen bromide in 100 ml of chloroform under nitrogen. After heating at reflux for 2.75 hours, the cooled product is washed with 10% sodium hydroxide and water, dried over anhydrous magnesium sulfate and concentrated to yield a crude solid which is chromatographed on silica gel (650 g) using ether-chloroform and is then recrystallized from ether-dichloromethane to yield a solid, mp 148°-150° C. of 1'-cyano-1-(2-nitrophenyl)spiro[indoline-3,4'-piperidine].

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