Synthesis of functionalized γ-lactams by a lewis acid catalyzed ketene formation/cyclization/claisen rearrangement sequence of 5,5-disubstituted Meldrum’s acid
作者:Xiao-Wan Lin、Mei Han、Mei-Hua Shen、Chi-Fan Zhu、Hua-Dong Xu
DOI:10.1016/j.tetlet.2022.153816
日期:2022.6
ketenes using Meldrum’s acid as ketene precursor. Derivatives of Meldrum’s acid with tertiary ammonia structure were used as raw material, and the reaction was catalyzed by Lewis acid at high-temperature conditions under microwave. Ketene formation by losing acetone and CO2, cyclization and claisen rearrangement occurred in sequence to form the γ-lactams.
以Meldrum's酸为乙烯酮前体,通过乙烯酮的分子内氮杂克莱森重排合成了一系列γ-内酰胺。以具有叔氨结构的Meldrum酸衍生物为原料,在微波高温条件下用路易斯酸催化反应。通过失去丙酮和CO 2形成乙烯酮,环化和克莱森重排依次发生,形成γ-内酰胺。