Direct Catalytic Enantioselective Vinylogous Aldol Reaction of α-Branched Enals with Isatins
作者:Carlo Cassani、Paolo Melchiorre
DOI:10.1021/ol302711w
日期:2012.11.2
The direct vinylogous aldol reaction of α-substituted α,β-unsaturated aldehydes with isatins is described. The chemistry provides easy access to valuable 3-substituted 3-hydroxyoxindole derivatives with high stereocontrol and perfect γ-site selectivity. Preliminary mechanistic studies suggest that, depending on the nature of the α-branched enal substituents, two divergent reaction mechanisms can be
描述了α-取代的α,β-不饱和醛与靛红的直接乙烯基醇醛缩醛反应。该化学试剂提供了易于获得的有价值的3-取代的3-羟基羟吲哚衍生物,具有很高的立体控制性和完美的γ位选择性。初步的机理研究表明,取决于α-支链烯基取代基的性质,两种不同的反应机理可以起作用,从而导致不同的产物和立体化学结果。