Enantioselective Pictet−Spengler-Type Cyclizations of Hydroxylactams: H-Bond Donor Catalysis by Anion Binding
作者:Izzat T. Raheem、Parvinder S. Thiara、Emily A. Peterson、Eric N. Jacobsen
DOI:10.1021/ja076179w
日期:2007.11.1
indolizinone and quinolizinone products are obtained in the thiourea-catalyzed cyclization of tryptamine-derived hydroxylactams. Substituent and counterion effect studies point to a novel mechanism of catalysis involving rate-limiting anion abstraction and binding by the thiourea.
在硫脲催化的色胺衍生的羟基内酰胺的环化中获得高度对映体富集的吲哚嗪酮和喹嗪酮产物。取代基和反离子效应研究指出了一种新的催化机制,涉及限速阴离子提取和硫脲结合。