Catalytic Chemo-, <i>E</i>/<i>Z</i>-, and Enantioselective Cyclizations of <i>o</i>-Hydroxybenzyl Alcohols with Dimedone-Derived Enaminones
作者:Jia-Jia Zhao、Yu-Chen Zhang、Meng-Meng Xu、Man Tang、Feng Shi
DOI:10.1021/acs.joc.5b01613
日期:2015.10.16
A catalytic chemo-, E/Z-, and enantioselective o-hydroxybenzyl alcohols with dimedone-derived enaminones has been established, which not only realized a chemoselective C1,2 cyclization of enaminones but also achieved the catalytic asymmetric construction of the biologically important tetrahydroxanthene framework with high E/Z- and enantioselectivities (all >95:5 E/Z, up to 98% yield, 97:3 er). This approach not only represents the first catalytic asymmetric C1,2 cyclization of enaminones with o-hydroxybenzyl alcohols but also provides an efficient strategy for constructing oxygenous heterocyclic frameworks with optical purity.