摘要:
Directed conjugate addition of the silylcuprate reagent lithium bis[diphenyl(diethylamino)silyl]-cuprate ((Ph(2)(Et(2)N)Si)(2)CuLi) to unsaturated esters and ketones is reported. The stereochemical course of the reaction can be-controlled by the presence of an appropriately disposed internal Lewis basic functionality, affording the corresponding beta-hydroxysilyl carbonyls with good to excellent levels of diastereoselection (e.g., 3b --> 4b).