Amberlyst-15-catalyzed intramolecular SN2′ oxaspirocyclization of tertiary allylic alcohols
作者:Jenn-jong Young、Liarng-jyur Jung、Kuang-ming Cheng
DOI:10.1016/s0040-4039(00)00390-7
日期:2000.4
A variety of substituted 1-oxaspiro[4,5]dec-6-ene and 1-oxaspiro[5,5]undec-7-ene systems have been prepared by utilizing Amberlyst-15-catalyzed S(N)2' oxaspirocyclizations under mild reaction conditions (-20 degrees C) in quantitative yields. In this process, a tertiary allylic alcohol serves as the precursor of pi-allylic carbocation and the primary, secondary or tertiary alcohol within the same molecule serves as the nucleophile, (C) 2000 Elsevier Science Ltd. All rights reserved.