Isoselenazolones as Catalysts for the Activation of Bromine: Bromolactonization of Alkenoic Acids and Oxidation of Alcohols
作者:Shah Jaimin Balkrishna、Ch Durga Prasad、Piyush Panini、Michael R. Detty、Deepak Chopra、Sangit Kumar
DOI:10.1021/jo301486c
日期:2012.11.2
selenium powder. The catalytic activity of the various isoselenazolones was studied in the bromolactonization of pent-4-enoic acid. Isoselenazolone 9 was studied as a catalyst in several reactions: the bromolactonization of a series of alkenoic acids with bromine or N-bromosuccinimide (NBS) in the presence of potassium carbonate as base, the bromoesterification of a series of alkenes using NBS and a variety
异硒烯酮是通过2-卤代苯甲酰胺与硒粉之间的铜催化Se-N键形成反应合成的。研究了异戊烯酮在戊-4-烯酸的溴化中的催化活性。研究了异壬烯酮9在以下反应中的催化剂:在碳酸钾为碱的情况下,用溴或N-溴丁二酰亚胺(NBS)溴化一系列链烯酸,使用NBS以及一系列其他方法对一系列烯烃进行溴酯化羧酸,以及使用溴作为氧化剂将仲醇氧化为酮。77揭示了异硒唑啉酮催化的溴化反应的机理细节Se NMR光谱和ES-MS研究。将溴氧化添加至异硒唑啉酮可得到二溴异硒唑酮(IV),这可能是反应条件下溴的活化的原因。从空间位阻效应Ñ苯基乙基对isoselenazolone和的酰胺基团的吸电子的isoselenazolone的苯并稠合的环上的取代基氟出现增强isoselenazolone的稳定性作为用于溴化反应的催化剂。