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 ethyl propiolate 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 ethyl propiolate in a polar or a protic
具有至少一个仲氨基的杂环烯酮缩醛在各种条件下与丙酸乙酯进行氮杂-烯键反应,生成相应的加合物,在有或没有乙醇钠回流的情况下,它们很容易转化为δ-内酰胺稠合的杂环产物乙醇,而酯和氰基取代的叔烯二胺则充当强迈克尔供体,可在极性或质子溶剂中添加到丙酸乙酯中。讨论了不同寻常的取代基对反应性和机理的影响。