7a-Hydroxy-2,3-dimethyl-3a,4,5,6,7,7a-hexahydro-3H-indole-3-carboxylic acid ethyl ester 、
2-Hydroxy-2,3-dimethyl-3,3a,4,5,6,7-hexahydro-2H-indole-3-carboxylic acid ethyl ester 在
aluminum oxide 作用下,
以
二氯甲烷 为溶剂,
反应 24.0h,
以20%的产率得到2,3-Dimethyl-4,5,6,7-tetrahydro-3H-indole-3-carboxylic acid ethyl ester