Diastereoselective Synthesis of δ-Aminoacids through Domino Ireland−Claisen Rearrangement and Michael Addition
摘要:
domino reaction-stereoselective Ireland-Claisen rearrangement and asymmetric Michael addition-is described. A protocol starting from Baylis-Hillman adducts 3a-f using chiral lithium amide affords optically active gamma-substituted delta-aminoacids 4a-f with high diastereoselectivities and enantioselectivities. The acid can be isolated easily from large-scale reactions and transformed to 2,3-disubstituted piperidines 11 or 2-substituted nipecotic acid derivates 12.
A simple synthesis of enantiomerically pure piperidine esters is described, offering a straightforward access to the trans-2,3-disubstituted piperidine skeleton which is present in a broad range of biologically active compounds.
Diastereoselective Synthesis of δ-Aminoacids through Domino Ireland−Claisen Rearrangement and Michael Addition
作者:Narciso M. Garrido、Mercedes García、David Díez、M. Rosa Sánchez、F. Sanz、Julio G. Urones
DOI:10.1021/ol8001464
日期:2008.5.1
domino reaction-stereoselective Ireland-Claisen rearrangement and asymmetric Michael addition-is described. A protocol starting from Baylis-Hillman adducts 3a-f using chiral lithium amide affords optically active gamma-substituted delta-aminoacids 4a-f with high diastereoselectivities and enantioselectivities. The acid can be isolated easily from large-scale reactions and transformed to 2,3-disubstituted piperidines 11 or 2-substituted nipecotic acid derivates 12.