Formation of functionalized cyclic ethers by intramolecular nitrile oxide cycloadditions
作者:Albert Padwa、Ugo Chiacchio、Dennis C. Dean、Allen M. Schoffstall、Alfred Hassner、K.S.K. Murthy
DOI:10.1016/s0040-4039(00)80447-5
日期:1988.1
The reaction of O-trimethylsilyl α-bromo aldoximes with unsaturated alcohols produces oximino ethers which can be readily oxidized with sodium hypochlorite. The transient nitrile oxide intermediate formed undergoes spontaneous cyclization affording fused isoxazolines. MM2 calculations help rationalize the observed stereoselectivity.
O-三甲基甲硅烷基的α-溴代醛肟与不饱和醇的反应产生了肟基醚,其易于被次氯酸钠氧化。形成的瞬态一氧化二氮中间体经过自发环化,生成稠合的异恶唑啉。MM2计算有助于合理化观察到的立体选择性。