Asymmetric Organocatalysis with Novel Chiral Thiourea Derivatives: Bifunctional Catalysts for the Strecker and Nitro-Michael Reactions
作者:Svetlana B. Tsogoeva、Denis A. Yalalov、Martin J. Hateley、Christoph Weckbecker、Klaus Huthmacher
DOI:10.1002/ejoc.200500420
日期:2005.12
both a thiourea moiety and an imidazole group on a chiral scaffold were synthesized and applied to the Strecker synthesis and nitro-Michael reaction. The addition of acetone to nitroolefins in the presence of these novel bifunctional organocatalysts gave enantioselectivities (up to 87 % ee) that are superior to those generated by the proline and/or homo-proline tetrazole catalysts described in the literature
合成了在手性支架上同时具有硫脲部分和咪唑基团的新型双功能有机催化剂,并将其应用于 Strecker 合成和硝基-迈克尔反应。在这些新型双功能有机催化剂的存在下,将丙酮加入硝基烯烃产生的对映选择性(高达 87% ee)优于文献中描述的脯氨酸和/或高脯氨酸四唑催化剂产生的对映选择性。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)