Chiral Piperazines as Efficient Catalysts for the Asymmetric Michael Addition of Aldehydes to Nitroalkenes
作者:Maria Teresa Barros、Ana Maria Faísca Phillips
DOI:10.1002/ejoc.200600731
日期:2007.1
Chiral piperazines were used as efficient catalysts in the addition of unmodified aldehydes to nitroalkenes. The nature of the solvent, temperature, and catalyst load were found to influence the outcome of the reaction. The products were obtained in good yields up to 88 %, high diastereoselectivities up to 97:3, and high enantiomeric excesses up to 85 %. Plain piperazine and its monohydrochloride were
手性哌嗪被用作将未改性的醛加成到硝基烯烃的有效催化剂。发现溶剂的性质、温度和催化剂负载量影响反应的结果。以高达 88% 的良好收率、高达 97:3 的高非对映选择性和高达 85% 的高对映体过量获得产物。普通哌嗪及其单盐酸盐可有效用作合成外消旋 γ-甲酰基硝基烷烃的有机催化剂。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)