Catalytic Diastereoselective Hetero-Diels–Alder Reaction of α-Haloacroleins with Alkenes: Construction of 3,4-Dihydropyran
作者:Lei Zeng、Qian Lei、Weidong Rao、Lizhu Gao
DOI:10.1021/acs.orglett.2c00341
日期:2022.3.25
In this Letter, a catalytic diastereoselective hetero-Diels–Alder reaction of α-haloacroleins with less polarized alkenes was developed, and the resulting 3,4-dihydropyrans were produced in high yields with a broad substate scope. Mechanism studies showed that 3,4-dihydropyran was produced from the ring expansion of cyclobutane, which was generated in the ring contraction of the initially formed unstable
在这封信中,开发了 α-卤代丙烯醛与极性较小的烯烃的催化非对映选择性杂 Diels-Alder 反应,并以高产率生产了具有广泛亚态范围的 3,4-二氢吡喃。机理研究表明,3,4-二氢吡喃是由环丁烷的扩环产生的,它是在最初形成的不稳定的3,4-二氢吡喃构象异构体的环收缩中产生的。