作者:Deniz Akalay、Gerd Dürner、Michael W. Göbel
DOI:10.1002/ejoc.200800179
日期:2008.5
Metal-free bisoxazolines catalyze the Diels–Alder reaction of N-substituted maleimides with anthrone derivatives leading to products in excellent yields and enantioselectivities up to 70 %. A mechanism relying on Bronsted-base catalysis is assumed to be involved with formation of an ion pair between the protonated catalyst and the anthrone enolate, which acts as a diene.(© Wiley-VCH Verlag GmbH & Co. KGaA
不含金属的双恶唑啉可催化 N-取代马来酰亚胺与蒽酮衍生物的 Diels-Alder 反应,从而产生出色的产率和高达 70% 的对映选择性。假设依赖布朗斯台德碱催化的机制涉及质子化催化剂和作为二烯的蒽酮烯醇化物之间离子对的形成。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany , 2008)