作者:Sven Strunk、Manfred Schlosser
DOI:10.1002/ejoc.200600304
日期:2006.10
A -75 DegC, alpha-lithiated allyl Ph ether undergoes mainly the Wittig rearrangement to afford, after acidic hydrolysis, 1-phenyl-2-propen-1-ol as the main product. A second metalation taking place at one of the ortho positions is the sole competing side reaction. Both, the significant decrease of the isomerization rate upon the introduction of a tert-Bu substituent in the para position of the arom
-75 摄氏度,α-锂化的烯丙基 Ph 醚主要经历 Wittig 重排,在酸水解后得到 1-苯基-2-丙烯-1-醇作为主要产物。在邻位之一发生的第二次金属化是唯一的竞争副反应。两者,在芳基的对位引入叔丁基取代基后异构化速率显着降低。环和完全没有重排产物表明存在内摩尔。添加/消除过程导致芳基迁移。第一步,α-对ipso-碳原子的亲核攻击产生螺连接的环氧乙烷基-环己二烯基锂物种。这种短寿命的中间体坍塌为最终产物,一种锂醇盐,通过同时结合金属原子的氧原子的核离去。[在 SciFinder (R) 上]