Catalytic Hydrogenation of Cyanohydrin Esters as a Novel Approach toN-Acylated β-Amino Alcohols – Reaction Optimisation by a Design of Experiment Approach
作者:Lars Veum、Silvia R. M. Pereira、Jan C. van der Waal、Ulf Hanefeld
DOI:10.1002/ejoc.200500870
日期:2006.4
The catalytic hydrogenation of acylated cyanohydrins and subsequent intramolecular migration of the acyl group to yield pharmaceutically interesting N-acyl β-amino alcohols is shown to be a successful one-pot preparation method. The combination of a multistep DoE approach and high-throughput methodology proved to be an effective strategy for the optimisation of the reaction. With the favoured catalyst/solvent
酰化氰醇的催化氢化和随后酰基的分子内迁移以产生药学上有趣的 N-酰基 β-氨基醇被证明是一种成功的一锅制备方法。多步骤 DoE 方法和高通量方法的结合被证明是优化反应的有效策略。使用二恶烷中镍载氧化铝的有利催化剂/溶剂组合,氢化和酰基迁移均顺利进行,使脂肪族底物的 N-酰基 β-氨基醇的产率(由 GC 确定)高达 90%,高达50% 为苄基的,后者更容易发生副反应。当使用对映纯氰醇酯时,没有发现在脂肪族分子的手性中心发生外消旋化,尽管使用苄基底物观察到 ee 的轻微下降。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)