Development and Comparison of the Substrate Scope of Pd-Catalysts for the Aerobic Oxidation of Alcohols
作者:Mitchell J. Schultz、Steven S. Hamilton、David R. Jensen、Matthew S. Sigman
DOI:10.1021/jo0482211
日期:2005.4.1
Three catalysts for aerobic oxidation of alcohols are discussed and the effectiveness of each is evaluated for allylic, benzylic, aliphatic, and functionalized alcohols. Additionally, chiral nonracemic substrates as well as chemoselective and diastereoselective oxidations are investigated. In this study, the most convenient system for the Pd-catalyzed aerobic oxidation of alcohols is Pd(OAc)2 in combination
讨论了用于酒精好氧氧化的三种催化剂,并评估了每种催化剂对烯丙基,苄基,脂肪族和官能化醇的有效性。另外,研究了手性非外消旋底物以及化学选择性和非对映选择性氧化。在这项研究中,Pd催化的酒精好氧氧化最方便的系统是Pd(OAc)2与三乙胺的组合。该系统可有效测试大多数酒精,并在温和的条件下(室温下使用3至5 mol%的催化剂)。钯(IiPr)(OAc)2(H 2 O)(1)也能成功氧化大多数评估的醇类。该系统的优点是可以显着降低催化剂的负载量,但需要更高的温度(60℃时催化剂的含量为0.1至1 mol%)。还公开了一种新的催化剂,Pd(IiPr)(OPiv)2(2)。该催化剂在非常温和的条件下(1摩尔%,室温和空气作为O 2源)运行,但底物范围受到限制。