Enantioselective Synthesis of Highly Functionalized Trifluoromethyl-Bearing Cyclopentenes: Asymmetric [3+2] Annulation of Morita-Baylis-Hillman Carbonates with Trifluoroethylidenemalonates Catalyzed by Multifunctional Thiourea-Phosphines
作者:Hong-Ping Deng、Yin Wei、Min Shi
DOI:10.1002/adsc.201101012
日期:2012.3.16
synthesis of multifunctional thiourea‐phosphines, a catalytic method for the asymmetric [3+2] annulation of Morita–Baylis–Hillmancarbonates with trifluoroethylidenemalonates has been developed, affording highly functionalized trifluoromethyl‐bearing cyclopentenes in excellent yields, high diastereoselectivities and enantioselectivities under mild conditions.
Phosphine-catalyzed asymmetric [4+1] annulation of Morita–Baylis–Hillman carbonates with dicyano-2-methylenebut-3-enoates
作者:Xiao-nan Zhang、Hong-Ping Deng、Long Huang、Yin Wei、Min Shi
DOI:10.1039/c2cc34619b
日期:——
asymmetric [4+1] annulation of MBH carbonates with dicyano-2-methylenebut-3-enoates has been developed for the first time, providing an efficient and enantioselectivesynthesis of highlyfunctionalized cyclopentenes bearing one all-carbon quaternarystereogeniccenter.
Morita–Baylis–Hillman carbonates from diverse aldehydes and methyl vinyl ketones can be directly utilised as palladium-trimethylenemethane 1,4-carbodipole-type precursors, and both reactivity and enantioselectivity are finely regulated by adding a chiral ammonium halide as the ion-pair catalyst. The newly assembled intermediates, proposed to contain an electronically neutral π-allylpalladium halide complex and a reactive
Asymmetric substitutions of O-Boc-protected Morita–Baylis–Hillman adducts with pyrrole and indole derivatives
作者:Long Huang、Yin Wei、Min Shi
DOI:10.1039/c1ob06671d
日期:——
An efficient asymmetricsubstitution process of O-Boc-protectedMorita–Baylis–Hillmanadducts with various pyrrole and indole derivatives has been developed in the presence of (DHQD)2PYR in THF, affording the corresponding products in good to high yields (up to 99% yield) and moderate to high ee values (up to 92 and 96% ee) under mild conditions.