<i>N</i>-Bromosuccinimide Promoted Ring Expansion Reactions: Diastereoselective Formation of Functionalized Azaspirocyclic Cyclopentanones
作者:Gregory R. Dake、Paul B. Hurley
DOI:10.1055/s-2003-42068
日期:——
N-Bromosuccinimide (NBS) induces ring enlargements of 2-(1-hydroxycyclobutyl)-p-toluenesulfonylenamides such as 1. These high yielding reactions typically occur with good diastereoselectivity. This ringexpansion protocolunder neutral conditions forms compounds that are potentially versatile intermediates for the construction of spirocycle-containing alkaloids.