5-cyano-7-hydroxymethyl-8-methyl-1-propyl-1,3,4,9-tetrahydro-pyrano[3,4-b]indole-1-carboxylic acid ethyl ester 在
manganese(IV) oxide 作用下,
以
1,1-二氯乙烷 为溶剂,
反应 1.0h,
以98%的产率得到5-cyano-7-formyl-8-methyl-1-propyl-1,3,4,9-tetrahydro-pyrano[3,4-b]indole-1-carboxylic acid ethyl ester