Enantioselective Direct Aldol Reactions of Achiral Ketones with Racemic Enolizable α-Substituted Aldehydes: Scope and Limitations
作者:Dale Ward、Vishal Jheengut、Garrison Beye、H. Gillis、Athanasios Karagiannis、Fabiola Becerril-Jimenez
DOI:10.1055/s-0030-1259525
日期:2011.3
Aldol reactions of racemic enolizable dioxolan-protected α-substituted-β-ketoaldehydes with representative achiral ketones catalyzed by proline or 5-(2-pyrrolidine-2-yl)-1H-tetrazole in wet DMSO proceed with dynamic kinetic resolution (or via DYKAT with an α-substituted-β-alkoxyaldehyde) to give adducts with high dr and ee.
由脯氨酸或 5-(2-吡咯烷-2-基)-1H-四唑在湿 DMSO 中催化的外消旋烯醇化二氧戊环保护的 α-取代-β-酮醛与代表性非手性酮的羟醛反应进行动态动力学拆分(或通过 DYKAT与α-取代-β-烷氧基醛)得到具有高 dr 和 ee 的加合物。