Enantioselective bifunctional iminophosphorane catalyzed sulfa-Michael addition of alkyl thiols to unactivated β-substituted-α,β-unsaturated esters
作者:Jinchao Yang、Alistair J. M. Farley、Darren J. Dixon
DOI:10.1039/c6sc02878k
日期:——
The highly enantioselective sulfa-Michael addition of alkyl thiols to unactivated β-substituted-α,β-unsaturated esters catalyzed by a bifunctional iminophosphorane (BIMP) organocatalyst is described.
Lewis Base Activation of Lewis Acids. Vinylogous Aldol Reactions
作者:Scott E. Denmark、Gregory L. Beutner
DOI:10.1021/ja035448p
日期:2003.7.1
A highly regioselective vinylogous aldol reaction catalyzed by SiCl4 and a chiral phosphoramide (R,R)-5, providing delta-hydroxy enones for a variety of aldehyde and dienol ether structures, has been developed. Low catalyst loadings (1 mol %) can be employed, giving the products in good yields, excellent enantioselectivities, and in some cases excellent anti diastereoselectivities. Both simple ester-derived
Rhodium Carbenoid Approach for Introduction of 4-Substituted (<i>Z</i>)-Pent-2-enoates into Sterically Encumbered Pyrroles and Indoles
作者:Yajing Lian、Huw M. L. Davies
DOI:10.1021/ol9028385
日期:2010.3.5
An unusual rhodium carbenoid approach for introduction of 4-substituted (Z)-pent-2-enoates into sterically encumbered pyrroles and indoles is described. These studies show that (Z)-vinylcarbenoids have a greater tendency than (E)-vinylcarbenoids to react at the vinylogous position of the carbenoid rather than at the carbenoid center.
描述了一种将 4-取代的 ( Z )-pent-2-enoates 引入空间阻碍的吡咯和吲哚中的不寻常的铑类胡萝卜素方法。这些研究表明,( Z )-乙烯基类胡萝卜素比( E )-乙烯基类胡萝卜素更倾向于在类胡萝卜素的插烯位置而不是在类胡萝卜素中心发生反应。