5-[1-(4,4-dimethyl-5-thioxopyrrolidin-2-ylidene)-ethyl]-3,4-dimethyl-1H-pyrrole-2-carboxylic acid tert-butyl ester 、 alkaline earth salt of/the/ methylsulfuric acid 在
三氟乙酸 作用下,
以34%的产率得到5-[1-(4,4-dimethyl-5-methylsulfanyl-3,4-dihydropyrrol-2-ylidene)-ethyl]-3,4-dimethyl-1H-pyrrole-2-carbaldehyde