Enantioselective organocatalytic Michael-hemiketalization catalyzed by a trans-bifunctional indane thiourea catalyst
作者:Yaojun Gao、Qiao Ren、Swee-Meng Ang、Jian Wang
DOI:10.1039/c1ob05404j
日期:——
An efficient, convenient and enantioselective Michael-hemiketalization reaction has been developed for the synthesis of naphthoquinones. In this work, a novel trans-bifunctional indane thiourea catalyst has been reported to promote this process to afford high yields (up to 99%) and high to excellent enantiomeric excesses (90–98% ee).
Enantioselective Michael Addition of 2-Hydroxy-1,4-naphthoquinone to β,γ-Unsaturated α-Keto Esters Catalyzed by Binaphthyl-Modified Squaramide
作者:Ji Hyun Lee、Dae Young Kim
DOI:10.5012/bkcs.2013.34.6.1619
日期:2013.6.20
catalyst loading and long reactiontime for high enantioselectivity. Accordingly, the develop-ment of alternative catalysts for the enantioselective Michaeladdition of 2-hydroxy-1,4-naphthoquinones to β,γ-unsatu-rated α-keto esters is highly desirable.As part of our research program related to the develop-ment of synthetic methods for the enantioselective construc-tion of stereogenic carbon centers,