Double Diastereoselective Acetate Aldol Reactions with Chiral<i> N</i>-Acetyl Thiazolidinethione Reagents
作者:Yingchao Zhang、Tarek Sammakia
DOI:10.1021/jo0605694
日期:2006.8.1
Double diastereoselective acetate aldol reactions using the N-acetyl thiazolidinethione-based chiral auxiliaries 1 and 2 and chiral aldehydes are described. Aldehydes that bear α-alkyl stereocenters exhibit moderate levels of double diastereoselection, while those that bear α- or β-alkoxy substitution exhibit little to no double diastereoselection. In all cases studied, the stereoselectivity of the
描述了使用基于N-乙酰基噻唑烷硫酮的手性助剂1和2和手性醛的双非对映选择性乙酸酯羟醛反应。带有α-烷基立体中心的醛表现出中等水平的双非对映异构,而带有α-或β-烷氧基取代的醛则几乎没有或没有双非对映异构。在所研究的所有情况下,反应的立体选择性均取决于试剂而不是底物。