The aza–ene or the Michael addition? Examination of an unusual substituent effect on the reaction of heterocyclic ketene aminals with ethyl propiolate
作者:Mei-Xin Zhao、Mei-Xiang Wang、Zhi-Tang Huang
DOI:10.1016/s0040-4020(02)00002-9
日期:2002.2
group underwent the aza–ene reaction with ethylpropiolate under various conditions to yield the corresponding adducts, which were readily transformed into the δ-lactam fused heterocyclic products with or without the aid of sodium ethoxide in refluxing ethanol, while the ester- and cyano-substituted tertiary enediamines acted as the strong Michael donor to add to ethylpropiolate in a polar or a protic