Rh-Catalyzed Asymmetric Hydroformylation of Functionalized 1,1-Disubstituted Olefins
作者:Xiao Wang、Stephen L. Buchwald
DOI:10.1021/ja2092689
日期:2011.11.30
The first method for the highly enantioselective rhodium-catalyzedhydroformylation of 1,1-disubstituted olefins has been developed. By employing either of the P-chirogenic phosphine ligands BenzP* and QuinoxP*, linear aldehydes with β-chirality can be prepared in a highly enantioselective fashion with good chemo- and regioselectivities.
Rhodium-catalyzed asymmetric anti-Markovnikov hydroformylation of α-substituted acrylates/acrylamides has been developed. By employing the Rh/(S,S)-DTBM-YanPhos complex, a series of β-chiral linear aldehydes were obtained in high yields (up to 94% yield) and high enantioselectivities (up to 96% ee). The utility of this methodology is demonstrated by a gram-scale reaction and a concise synthetic route