我们通过概念上不同的扩环策略开发了一种有效的中环和大环内酯合成方法。The design of an unprecedented ring conjunction mode of oxetene, combined with the appropriate choice of a Lewis acid promoter and an additive, constitutes the key components of the new process. 通过这种新方法,反应不需要高度稀释或缓慢添加。
New Platinum-Catalysed Dihydroalkoxylation of Allenes
作者:María Paz Muñoz、María C. de la Torre、Miguel A. Sierra
DOI:10.1002/adsc.201000342
日期:2010.9.10
A new platinum‐catalysed dihydroalkoxylation of allenes is described to give aliphatic acetals by an unexpected attack of two molecules of methanol to the terminal carbon of the allene moiety. Deuteration experiments suggest an unprecedented formal 1,3‐dipolar addition of methanol to a zwitterionic platinum carbene as the key step. The first platinum‐catalysed intermolecular carbon‐based nucleophile
Synthesis of medium-sized lactones from siloxy alkynes via ring expansion
作者:An Wu、Wanxiang Zhao、Jianwei Sun
DOI:10.1016/j.tet.2020.131163
日期:2020.12
topic in organic synthesis due to the disfavored kinetic and thermodynamic features. Herein we detail an efficient intermolecular process using siloxyalkynes as substrates and oxetene ring expansion as the key strategy. With extension to a new silyl-masked alkyne, this reaction now features a broad scope, high efficiency, and mild conditions.