反应详情

20.1 Grams 2-chloro-5-nitrobenzoic acid was added in portions to 87 ml morpholine. The temperature of the thick mixture rose to 75° C. After being stirred at reflux temperature for five hours, the mixture was poured into ice water, made acidic with concentrated HCl, filtered, dried and recrystallized from ethanol to give 20.3 grams 2-morpholino-5-nitrobenzoic acid. m.p. = 168°-170° C. The nitro compound was reduced catalytically in ethanol-water (3:1) with 5% palladium on carbon catalyst to give 5-amino-2-morpholinobenzoic acid. m.p. = 307°-308° C.