Intramolecular 4+3 cycloadditions. A cyclohexenyl cation, its halogenated congener and a quasi-Favorskii rearrangement
作者:Michael Harmata、Gary Bohnert、Laszlo Kürti、Charles L. Barnes
DOI:10.1016/s0040-4039(02)00264-2
日期:2002.3
Treatment of alkoxycyclohexenols bearing a tethered diene substituent with a Lewis acid results in intramolecular 4+3 cycloaddition with complete endo selectivity. A cycloadduct bearing a bromo substituent at a bridgehead position undergoes a quasi-Favorskii rearrangement in near quantitative yield upon reaction with lithium aluminum hydride.
Intramolecular 4+3 cycloadditions. Some examples of surprisingly high levels of simple diastereoselection
作者:Michael Harmata、Gary Bohnert、Charles L Barnes
DOI:10.1016/s0040-4039(00)01913-4
日期:2001.1
The reaction of alcohols 6 and 7 with triflic anhydride and 2,6-lutidine results in the formation of the corresponding 4+3 cycloadducts with surprisingly high levels of simple diastereoselection. (C) 2000 Elsevier Science Ltd. All rights reserved.