5—Endo ring closures of allylic hydroperoxides: Useful routes to 1,2—dioxolanes involving strongly stereoselective free radical and polar reactions
作者:John L. Courtneidge、Melanie Bush、Lay See Loh
DOI:10.1016/s0040-4020(01)92274-4
日期:1992.1
Intramolecular cyclisation of simple allylic hydroperoxides to give substituted 1,2—dioxolanes using electrophilic reagents has been investigated. Closure using mercury(II) acetate and electrophilic halogen reagents (NBS, Br2 ButOC1) occurs by Markovnikov—directed and conformationally strict stereospecificity. Subsequent free— radical reaction of the mercurated dioxolanes involved specific reaction
已经研究了使用亲电子试剂将简单的烯丙基氢过氧化物分子内环化以生成取代的1,2-二氧戊环的方法。使用乙酸汞(II)和亲电卤素试剂(NBS,Br 2 Bu t OC1)封闭是由马尔科夫尼科夫(Markovnikov)指导的,构象严格的立体特异性。随后,汞化二氧戊环的自由基反应涉及特定的反应,该反应涉及来自中间体二氧戊环基自由基的空间未保护面的反应。