Novel tocopherol compounds I. Bromination of α-tocopherol — reaction mechanism and synthetic applications
作者:T. Rosenau、W.D. Habicher
DOI:10.1016/0040-4020(95)00421-4
日期:1995.7
including the occurrence of an ortho-quinone methide, not as a radical-chain reaction, contrary to earlier reports. The ortho-quinone methide intermediate is also produced by oxidation of a-tocopherol with silver oxide and can be trapped in the presence of electron-rich dienophiles in a hetero-Diels-Alder reaction to form novel dichromanes in high yields.
与较早的报道相反,α-生育酚的溴化过程显示为两步过程,其中包括邻醌甲基化物的发生,而不是自由基链反应。邻苯二甲酮甲基化物中间体也可通过α-生育酚与氧化银的氧化反应制得,并可在富电子二烯亲和体存在下,通过杂Diels-Alder反应捕获,以高收率形成新型重铬烷。