Zn(ClO4)2·6H2O as a Powerful Catalyst for a Practical Acylation of Alcohols with Acid Anhydrides
作者:Giuseppe Bartoli、Marcella Bosco、Renato Dalpozzo、Enrico Marcantoni、Massimo Massaccesi、Letizia Sambri
DOI:10.1002/ejoc.200300458
日期:2003.12
new protocol for the acylation of alcohols with anhydrides in the presence of Zn(ClO4)2·6H2O as the catalyst is reported. The activity of Zn(ClO4)2·6H2O has been proven to be superior to that exerted by dry Mg(ClO4)2 and by metal triflates. Its efficiency allows reactions between poorly reactive substrates, such as sterically hindered tertiary alcohols and aromatic anhydrides. All of the reactions
报道了一种在 Zn(ClO4)2·6H2O 作为催化剂的情况下用酸酐酰化醇的新方案。已证明 Zn(ClO4)2·6H2O 的活性优于干燥的 Mg(ClO4)2 和金属三氟甲磺酸盐。其效率允许反应性较差的底物(例如位阻叔醇和芳香酸酐)之间发生反应。所有反应均以1:1.05的醇/酸酐比进行。从实用和经济的角度来看,这些条件非常方便,因为它们避免了试剂的浪费并允许简单的后处理程序。Zn(ClO4)2·6H2O 的催化作用对酸酐的活化非常特殊,以至于在酯化过程中对酸敏感的官能团和起始材料的立体化学构型保持不变。在所有情况下,酰化产物都是以纯形式定量获得的。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)