Lewis acid mediated cascade reactions of silyl-substituted methylenecyclopropyl ketones
作者:Guillaume L.N Peron、John Kitteringham、Jeremy D Kilburn
DOI:10.1016/s0040-4039(99)02342-4
日期:2000.3
cyclisation of various silyl-substituted methylenecyclopropyl ketones has been investigated. The presence of the silyl-substituent enhances the reactivity of the methylene cyclopropane in comparison to our earlier study on non-silyl-substituted methylenecyclopropyl ketones, allowing milder Lewis acids (BF3·Et2O or BF3·2AcOH) to be used for the cyclisation reaction. The mild conditions used allow the allyl
已经研究了路易斯酸介导的各种甲硅烷基取代的亚甲基环丙基酮的环化。与我们之前对非甲硅烷基取代的亚甲基环丙基酮的研究相比,甲硅烷基取代基的存在增强了亚甲基环丙烷的反应性,从而允许使用较弱的路易斯酸(BF 3 ·Et 2 O或BF 3 ·2AcOH)环化反应。使用的温和条件使烯丙基阳离子(环化过程中的中间体)被困在进一步的碳-碳键形成反应中。