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.