Convenient, Benign and Scalable Synthesis of 2- and 4-Substituted Benzylpiperidines
作者:Béla Ágai、Ágnes Proszenyák、Gábor Tárkányi、László Vida、Ferenc Faigl
DOI:10.1002/ejoc.200400215
日期:2004.9
A short, scalable and environmentally benign synthesis of 2- and 4-substituted benzylpiperidines has been developed. The method is based on the temperature-programmed consecutive deoxygenation and heteroaromatic ring saturation of aryl(pyridin-2-yl)- and aryl(pyridin-4-yl)methanols and aryl(pyridin-4-yl)methanones in the presence of Pd/C catalyst. The crucial roles of the temperature, the acidity and
2-和4-取代苄基哌啶的短时间、可扩展和环境友好的合成已经被开发。该方法基于在 Pd 存在下芳基(吡啶-2-基)-和芳基(吡啶-4-基)甲醇和芳基(吡啶-4-基)甲酮的程序升温连续脱氧和杂芳环饱和/C 催化剂。温度、酸度和底物结构在选择性变化中的关键作用已通过几种取代芳基(哌啶)甲醇的分离得到证实。甲醇和酮由市售的吡啶甲醛或 4-氰基吡啶和取代的溴苯通过有机金属中间体制备。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)