The [4 + 2] Addition of Singlet Oxygen to Thebaine: New Access to Highly Functionalized Morphine Derivatives via Opioid Endoperoxides
作者:Dolores López、Emilio Quiñoá、Ricardo Riguera
DOI:10.1021/jo000288a
日期:2000.7.1
prevents its oxidation and thus the photooxidation of 3 in acid media constitutes a one-pot procedure for the preparation of 14-hydroxycodeinone 35. Photooxidation of the thebaine ammonium salt 31 allows the isolation in good yields of the corresponding to thebaine endoperoxide 32. The selective protection and reduction of the keto, aldehyde, and olefinic groups of hydrodibenzofuran 10 allowed the preparation
蒂巴因(3)在日光下的光氧化作用产生两种主要产物:加氢二苯并呋喃10(主要)和苯并呋喃11(次要)。如果使用汞灯代替太阳灯,则后一种化合物将占主导地位。10的形成经由过氧过氧化物中间体进行,该中间体在氮原子上进行氧化。通过质子化或季铵化保护氮防止了其氧化,因此在酸性介质中对3进行光氧化构成了制备14-羟基可待因酮35的一锅法。蒂巴因铵盐31的光氧化使得能够以高收率分离出蒂巴因铵盐31。相应地对应于蒂巴因内过氧化物32。加氢二苯并呋喃10的酮基,醛基和烯基的选择性保护和还原使得可以制备几种二醇和酮醇衍生物。