作者:Enrico Emer、Paola Galletti、Daria Giacomini
DOI:10.1002/ejoc.200900181
日期:2009.7
6-Aminopenicillanic acid (6-APA) and two of its derivatives, 6-APA benzyl ester (6-APA-OBn) and Penicillin G (PenG), have been evaluated as catalysts for use in direct cross-aldol reactions in different solvents and mixtures. The effects of catalyst loading, reaction time, pH and temperature on the yield and stereoselectivity have been studied. 6-APA proved to be an effective catalyst in terms of yield
6-氨基青霉烷酸 (6-APA) 及其两种衍生物 6-APA 苄酯 (6-APA-OBn) 和青霉素 G (PenG) 已被评估为用于不同溶剂中直接交叉羟醛反应的催化剂和混合物。研究了催化剂负载量、反应时间、pH 值和温度对产率和立体选择性的影响。就环己酮和对硝基苯甲醛之间的反应收率而言,6-APA 被证明是一种有效的催化剂,尤其是在纯条件下。反应的立体选择性受两种竞争机制的影响:一种是亚胺-烯胺途径,另一种是布朗斯台德酸催化。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)