Facile Reduction of Aromatic Aldehydes, Ketones, Diketones and Oxo Aldehydes to Alcohols by an Aqueous TiCl3/NH3 System: Selectivity and Scope
作者:Angelo Clerici、Nadia Pastori、Ombretta Porta
DOI:10.1002/1099-0690(200210)2002:19<3326::aid-ejoc3326>3.0.co;2-v
日期:2002.10
quantitative reduction of aromatic aldehydes, ketones, diketones and oxo aldehydes to alcohols by use of TiCl3/NH3 in aqueous methanol solution is reported. The reducing system distinguishes between different classes of aldehydes and/or ketones, and many functionalities that usually do not survive under reducing conditions are tolerated well. The concept of reversal of chemoselectivity has also been developed
报道了使用 TiCl3/NH3 在甲醇水溶液中几乎定量地将芳香醛、酮、二酮和氧代醛还原为醇的简单而快速的方法。还原系统区分不同类别的醛和/或酮,并且许多通常在还原条件下无法存活的官能团可以很好地耐受。化学选择性逆转的概念也得到了发展。提出了一种基于从 TiIII 到羰基碳原子的两个连续单电子转移的机制,第二个 SET 仅在存在铵离子(添加或原位形成)时才起作用。(© Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)