4-oxo-5,6,7,8-tetrahydro-4H-cyclohepta[b]pyrrole-1,3-dicarboxylic acid 1-tert-butyl ester 3-ethyl ester 、
三(二甲氨基)甲烷 在
乙醚 作用下,
以
乙醚 为溶剂,
反应 4.5h,
以affording 847 mg (87%) of 5-dimethylaminomethylene-4-oxo-1,4,5,6,7,8-hexahydro-cyclohepta[b]pyrrole-3-carboxylic acid ethyl ester as a light yellow-orange solid的产率得到5-dimethylaminomethylene-4-oxo-1,4,5,6,7,8-hexahydro-cyclohepta [b] pyrrole-3-carboxylic acid ethyl ester