Novel access to cyclohexane-1,4-diones and 1,4-hydroquinones via radical 1,2-acyl rearrangement on 2-(halomethyl)cyclopentane-1,3-diones using cobaloxime-mediated electroreduction or tributyltin hydride
作者:Hiroyuki Kawafuchi、Tsutomu Inokuchi
DOI:10.1016/s0040-4039(02)00163-6
日期:2002.3
hydroquinones 3, with the option of introducing alkyl and aryl substituents, was developed by radical 1,2-acyl rearrangement on 2-(halomethyl)cyclopentane-1,3-diones 1, accessible from 1,2-bis(trimethylsiloxy)cyclobutene and α-bromo ketone dimethyl acetals. The electroreduction of monoacetals of 1 in the presence of cobaloxime as a catalyst afforded the cyclohexane-1,4-dione monoacetals in good yields
通过在2-(卤甲基)环戊烷上进行自由基1,2-酰基重排,开发了一种制备合成上可使用的环己烷-1,4-二酮2及其氧化类似物对苯二酚3的新方法,并可以选择引入烷基和芳基取代基。 -1,3-二酮1,可从1,2-双(三甲基甲硅烷氧基)环丁烯和α-溴代酮二甲基乙缩醛中获得。在钴肟作为催化剂的存在下,单缩醛1的电还原以良好的收率得到了环己烷-1,4-二酮单缩醛。在苯中回流下Bu 3 SnH还原2-芳基1进行重排,得到2,当反应延长时,芳构化为3进行了中等产量。