Enantioselective Synthesis of Cyclohexenol Derivatives from γ-Aryl-Substituted Enals via an Organocatalyzed Three-Component Reaction
作者:Debashis Majee、Satish Jakkampudi、Hadi D. Arman、John C.-G. Zhao
DOI:10.1021/acs.orglett.9b03532
日期:2019.11.15
A three-componentreaction between γ-aryl-substituted α,β-unsaturated aldehydes and nitroalkenes was realized by using cinchona alkaloid-derived (thio)ureas and squaramides via the dienolate intermediates. This unprecedented 1,3- and 1,5-reactivity of dienolates of the γ-aryl-α,β-unsaturated aldehydes led to the formation of cyclohexenol derivatives with four contiguous stereogenic centers and a chiral
Catalytic asymmetric cycloetherification via intramolecular oxy-Michael addition of enols
作者:Ryuichi Murata、Keisuke Asano、Seijiro Matsubara
DOI:10.1016/j.tet.2021.132381
日期:2021.9
compounds as oxygen nucleophiles. In particular, there are only a few reports on the oxy-Michael addition of the enol forms of carbonyl nucleophiles. In this study, we present the asymmetric cycloetherification of enols, which are generated in situ from enone-bearing ketones, using chiralbifunctionalorganocatalysts bearing amino and squaramide groups. This transformation chemo- and enantioselectively afforded