Studies on dioxirane chemoselectivity: the oxidation of an enamino moiety present in a Fischer carbene complex
作者:Anna-Maria Lluch、Mariona Gibert、Francisco Sánchez-Baeza、Angel Messeguer
DOI:10.1016/s0040-4020(96)00051-8
日期:1996.3
was investigated. Thus, treatment of 1 with 3 molecular equivalents of DMD afforded a 52% yield of amide 3 as unique isolable organic product. When the reaction was performed with 1 molecular equivalent of DMD the formation of the enol intermediate 15 was evidenced by its capture as the tetrafluoroboric acid salt 16. This salt was unstable and when it was exposed to air gave rise to amide 3 and to
研究了二甲基二环氧乙烷(DMD)促进的Fischer卡宾配合物1的氧化分解,该配合物包含一个共轭的烯氨基部分。因此,用3分子当量的DMD处理1得到52%产率的酰胺3,其为独特的可分离的有机产物。当用1分子当量的DMD进行反应时,通过捕获为四氟硼酸盐16证明了烯醇中间体15的形成。该盐不稳定,当暴露于空气中时会生成酰胺3以及少量的苯甲酸乙酯和苯乙酮。这些结果表明,与Fischer卡宾部分共轭的烯胺基的存在颠倒了先前在DMD促进的这些化合物的复合中观察到的化学选择性。因此,主要途径包括通过形成烯醇中间体的氧化烯氨基双键,该烯醇中间体与氧反应产生分子分解产生的产物。