Synthesis of Butenolides via a Horner–Wadsworth–Emmons Cascading Dimerization Reaction
作者:Jack Everson、Milton J. Kiefel
DOI:10.1021/acs.joc.9b02015
日期:2019.12.6
structurally related butenolides has been observed while we were exploring the substrate-scope of a Horner-Wadsworth-Emmons (HWE) reaction. While aliphatic aldehydes gave the expected HWE product, aromatic aldehydes furnished butenolides, resulting from the dimerization of the HWE product during desilylation of the initially formed HWE adduct. In addition to isolating butenolides in a high yield, we
在我们研究霍纳-沃兹沃思-埃蒙斯(HWE)反应的底物范围时,已观察到一系列结构相关的丁烯内酯的有效合成。尽管脂族醛提供了预期的HWE产物,但芳族醛提供了丁烯内酯,这是由于在最初形成的HWE加合物的甲硅烷基化过程中HWE产物的二聚作用所致。除了高产率地分离丁烯内酯外,我们还精确地确定了二聚化发生的时间。