Synthesis of γ-Lactams by Mild, <i>o</i>-Benzoquinone-Induced Oxidation of Pyrrolidines Containing Oxidation-Sensitive Functional Groups
作者:Hao-Jie Rong、Yong-Feng Cheng、Fan-Fan Liu、Shu-Jian Ren、Jin Qu
DOI:10.1021/acs.joc.6b02562
日期:2017.1.6
of the pyrrolidine ring, and then the N,O-acetal is further oxidized by the o-benzoquinone to the γ-lactam. Because the first oxidation occurs selectively at the α-C–H of the pyrrolidine ring, oxidation-sensitive functional groups (allyl-, vinyl-, hydroxyl-, and amino groups) on pyrrolidine ring are unaffected. The synthetic utility of this novel method was demonstrated by the facile syntheses of (S)-vigabatrin
取代的吡咯烷的后期氧化为γ-内酰胺文库的构建提供了良好的灵活性,尤其是近年来,已经有用于吡咯烷官能化的方法。我们报道了一种将吡咯烷氧化为γ-内酰胺的新策略:吡咯烷与邻苯醌的反应通过直接氧化吡咯烷环的α-C–H键,然后再氧化N,得到N,O-乙缩醛。邻缩醛被邻苯醌进一步氧化成γ-内酰胺。因为第一次氧化选择性地发生在吡咯烷环的α-C–H上,所以吡咯烷环上的氧化敏感性官能团(烯丙基,乙烯基,羟基和氨基)不受影响。(S)-vigabatrin和两个类似物的简便合成证明了这种新方法的合成效用。