Alkynyl Acylammoniums as Electrophilic 3C Synthons in a Formal [3 + 3] Annulation: Access to Functionalized 4<i>H</i>-Pyran-4-ones
作者:Shuding Dong、Chao Fang、Weifang Tang、Tao Lu、Ding Du
DOI:10.1021/acs.orglett.6b01891
日期:2016.8.5
acylammoniums generated in situ from alkynyl acids are first used as electrophilic 3C synthons in a formal [3 + 3] annulation with 1,3-dicarbonyl compounds for regioselective synthesis of functionalized 4H-pyran-4-ones via a 4-(dimethylamino)pyridine/Lewis acid dual-activation strategy. This protocol paves the way for further investigation of alkynyl acylammoniums as 3C synthons for construction of diverse heterocyclic
由炔酸原位生成的炔基酰基lam首先在与1,3-二羰基化合物进行正式的[3 + 3]环合中用作亲电子3C合成子,以通过4-(二甲氨基)区域选择性合成功能化的4 H-吡喃-4-酮。吡啶/路易斯酸双重激活策略。该协议为进一步研究炔基酰基lam作为3C合成子构建各种杂环骨架铺平了道路。