Diastereoselective Aza-Baylis-Hillman Reactions: Synthesis of Chiral α-Allenylamines and 2-Azetines from Allenic Esters
作者:Bruna S. Santos、Ana L. Cardoso、Ana Matos Beja、Manuela Ramos Silva、José A. Paixão、Francisco Palacios、Teresa M. V. D. Pinho e Melo
DOI:10.1002/ejoc.200901415
日期:2010.6
The reactivity of allenicesters towards activated N-sulfonylimines in the presence of DABCO was explored. A formal [2+2] cycloaddition of benzyl buta-2,3-dienoate and N-arylidenebenzenesulfonamides yielded mainly 2-methyleneazetidines. Interestingly, a DABCO-catalysed reaction of 2,3-allenoates, bearing a chiral auxiliary on the ester moiety, with N-arylidenebenzenesulfonamides led to optically active