The preparation of annulated furan systems as key synthetic intermediates through the application of a two-step annulation involving an electrochemical ring closure between a furan and a silyl enol ether has been studied. The reaction was shown to be quite general for the formation of six-membered rings in good yields and was tolerant of a variety of different functional groups. The ring closure was
已经研究了通过在
呋喃和甲
硅烷基烯醇醚之间进行电
化学闭环的两步环化法制备作为主要合成中间体的环
呋喃体系。对于六元环的形成,以高产率形成该反应是相当普遍的,并且耐受各种不同的官能团。闭环是高度立体选择性的,导致形成顺式融合系统。循环伏安法和探针分子可用于深入了解反应。这些研究表明,关键环的闭合涉及甲
硅烷基烯醇醚的初始氧化为自由基阳离子,然后
呋喃终止的环化。