Vinylethylene Carbonates as <i>α,β</i>-Unsaturated Aldehyde Surrogates for Regioselective [3 + 3] Cycloaddition
作者:Yi Xu、Lu Chen、Yu-wen Yang、Zhiqiang Zhang、Weibo Yang
DOI:10.1021/acs.orglett.9b02266
日期:2019.9.6
operationally simple [3 + 3] cycloaddition of vinylethylene carbonates with triazinanes. Interestingly, we could also use this method for a [3 + 3] oxidative cycloaddition, which allows the facile synthesis of polysubstituted terphenyls under mild conditions. Mechanistic studies suggest that vinylethylene carbonates could generate α,β-unsaturated aldehydes as 3-carbon synthons for cycloaddition via a combination
在这里,我们报告了一种新颖的逐步加成控制环大小的方法,可通过碳酸三亚乙烯酯与碳酸亚乙烯酯的操作简单的[3 + 3]环加成反应来获得四氢嘧啶。有趣的是,我们也可以将此方法用于[3 + 3]氧化环加成反应,该方法可以在温和条件下轻松合成多取代的三联苯。机理研究表明,碳酸乙烯亚乙酯可通过Pd催化脱羧和β-H消除的组合过程,生成α,β-不饱和醛作为3-碳合成子进行环加成反应。