Zirconium(IV) Chloride as a New, Highly Efficient, and Reusable Catalyst for Acetylation of Phenols, Thiols, Amines, and Alcohols under Solvent-Free Conditions
作者:Asit K. Chakraborti、Rajesh Gulhane
DOI:10.1055/s-2004-815442
日期:——
chloride has been found to be a new. highly efficient, and reusable catalyst for acetylation of structurally diverse phenols, thiols, amines and alcohols under solvent-free condtions. Acetylation of sterically hindered and electron deficient phenols is achieved in excellent yields with stoichiometric amounts of Ac 2 O at room temperature. Acid-sensitive alcohols undergo acetylation with excellent chemoselectivity
已发现氯化锆 (IV) 是一种新的。一种高效、可重复使用的催化剂,用于在无溶剂条件下对结构不同的酚、硫醇、胺和醇进行乙酰化。在室温下使用化学计量量的 Ac 2 O 以极好的收率实现空间位阻和缺电子酚的乙酰化。酸敏感醇以优异的化学选择性进行乙酰化,而不会发生脱水或重排等竞争性副反应。催化剂的温和路易斯酸性质使乙酰化能够与光学活性底物一起进行,而不会对光学纯度产生任何不利影响。