环己酮 、
3-肼基苯甲酸 在
silica gel 、
6,7,8,9-tetrahydro-5H-carbazole-4-carboxylic acid 作用下,
以
溶剂黄146 为溶剂,
以2,3,4,9-tetrahydro-1H-carbazole-7-carboxylic acid [Reference Example 16b: FAB: 216 (M+H)+] were obtained的产率得到2,3,4,9-tetrahydro-1H-carbazole-7-carboxylic acid