Strain‐Driven Dyotropic Rearrangement: A Unified Ring‐Expansion Approach to α‐Methylene‐γ‐butyrolactones
作者:Xiaoqiang Lei、Yuanhe Li、Yang Lai、Shengkun Hu、Chen Qi、Gelin Wang、Yefeng Tang
DOI:10.1002/anie.202013169
日期:2021.2.19
dyotropic rearrangement of α‐methylene‐β‐lactones has been realized, which enables the efficient access of a wide range of α‐methylene‐γ‐butyrolactones displaying remarkable structural diversity. Several appealing features of the reaction, including excellent efficiency, high stereospecificity, predictable chemoselectivity and broad substrate scope, render it a powerful tool for the synthesis of MBL‐containing
已经实现了前所未有的应变驱动的α-亚甲基-β-内酯的重整排列,这使得能够有效利用显示出显着结构多样性的各种α-亚甲基-γ-丁内酯。该反应的几个吸引人的特征,包括出色的效率,高立体特异性,可预测的化学选择性和广泛的底物范围,使其成为合成天然或合成来源的含MBL分子的有力工具。实验和计算证据均表明,致各向异性重排的新变体以二元模式进行:虽然异步协同机制最有可能解释了以氢迁移为特征的反应,但在芳基迁移的情况下,涉及involving离子中间体的逐步过程是有利的。