Simple monosulfonated cyclohexane-1,2-diamines are highly enantioselective organocatalysts for the conjugate addition of ketones to nitro olefins. By focusing on aromatic ketones as the most challenging substrates, selectivities of up to 98 % ee can be achieved for the title reaction. Moreover, a three-component process between the primary amine catalyst, the nitroalkene, and the ketone, which results
简单的单磺化
环己烷-1,2-二胺是高度对映选择性的有机催化剂,用于酮与硝基烯烃的共轭加成。通过将
芳香酮作为最具挑战性的底物,标题反应可以实现高达 98% ee 的选择性。此外,
伯胺催化剂、硝基烯烃和酮之间的三组分过程会导致
吡咯的不可逆形成,这被认为是催化剂失活的反应途径。 (© Wiley-
VCH Verlag GmbH & Co. KGaA , 69451 德国魏因海姆,2009)