Regioselective Intramolecular Oxidation of Phenols and Anisoles by Dioxiranes Generated in Situ
作者:Dan Yang、Man-Kin Wong、Zheng Yan
DOI:10.1021/jo000458j
日期:2000.6.1
and H(2)O, oxidation of phenol derivatives 1-10 afforded spiro 2-hydroxydienones in 24-55% yields regardless of the presence of other substituents (ortho Me, meta Me or Br) on the aryl ring and the length of the linker. Experimental evidences were provided to support the mechanism that involves a regioselective pi bond epoxidation of aryl rings followed by epoxide rearrangement and hemiketal formation
已经开发了一种用于酚和茴香的区域选择性氧化的新方法,其中由酮和Oxone原位生成的二恶英类化合物以分子内方式氧化酚衍生物。一系列具有吸电子基团的酮,例如CF(3),COOMe和CH(2)Cl,通过C(2)或C(3)亚甲基连接基连接到苯酚,茴香醚或芳基环上。在CH(3)CN和H(2)O的均相溶剂系统中,苯酚衍生物1-10的氧化反应以2-55%的收率得到螺2-羟基二烯酮,而与其他取代基的存在无关(邻位Me,间位Me或Br)和芳基环的长度。提供了实验证据来支持涉及芳基环的区域选择性pi键环氧化,然后环氧化物重排和半缩酮形成的机制。