Lewis acid mediated reactions of organocopper reagents. Entrainment in the conjugate addition to .alpha.,.beta.-unsaturated ketones, esters, and acids via the RCu.cntdot.BF3 system
Highly Regio- and Stereoselective Addition of Organolithium Reagents to Extended Conjugate Amides Using (<i>S</i>,<i>S</i>)-(+)-Pseudoephedrine as Chiral Auxiliary
作者:Marta Ocejo、Luisa Carrillo、Dolores Badía、Jose L. Vicario、Naiara Fernández、Efraim Reyes
DOI:10.1021/jo900397w
日期:2009.6.5
The conjugate addition of organolithiumreagents to polyunsaturated conjugate amides containing (S,S)-(+)-pseudoephedrine as chiral auxiliary has been studied in detail. The reaction proceeded with good 1,4-selectivity and excellent stereoselectivity, affording the corresponding addition products with good yields and as highly diastereoenriched isomers. Removal of the chiral auxiliary by reduction