The first regio-, diastereo-, and enantioselective direct Michaelreaction of β,γ-unsaturated ketones with nitroolefins is enabled by Brønsted base/hydrogen-bonding bifunctional catalysis. A squaramide-substituted tertiary amine catalyzes the reaction of a broad range of β,γ-unsaturated ketones to proceed at the α-site exclusively, giving rise to adducts with two consecutive tertiary carbon stereocenters
Alkyl, Unsaturated, (Hetero)aryl, and N-Protected α-Amino Ketones by Acylation of Organometallic Reagents
作者:Alan R. Katritzky、Khanh N. B. Le、Levan Khelashvili、Prabhu P. Mohapatra
DOI:10.1021/jo0614801
日期:2006.12.1
Stable and easily accessible N-acylbenzotriazoles, derived from a variety of aliphatic, unsaturated, (hetero)aromatic, and N-protected α-amino carboxylicacids, were reacted with Grignard and heteroaryllithium reagents to afford corresponding ketones in good to excellent yields.