The Syntheses of Pyrazino-Containing Sultines and Their Application in Diels−Alder Reactions with Electron-Poor Olefins and [60]Fullerene
作者:Jing-Horng Liu、An-Tai Wu、Ming-Hwei Huang、Chein-Wei Wu、Wen-Sheng Chung
DOI:10.1021/jo9918448
日期:2000.6.1
The Diels-Alder reactions of heterocyclic o-quinodimethanes, generated in situ from 6,7-disubstituted quinoxalino[2,3-d]-[1, 2lambda(4)]oxathiine 2-oxides (6a-c), 2,3-disubstituted-8, 9-dihydro-6H-8lambda(4)-[1,2]oxathiino[4,5-g]quinoxalin-8-one (7a-c) (sultines), and pyrazinosultine (22), with electron-poor olefins and [60]fullerene are described. The heterocyclic-fused sultines 7a-c and 22 are readily
由6,7-二取代的喹喔啉[2,3-d]-[1,2lambda(4)]草嘌呤2-氧化物(6a-c),2,3原位生成的杂环邻喹啉甲烷的Diels-Alder反应-二取代的8、9-二氢-6H-8lambda(4)-[1,2]氧杂噻吩并[4,5-g]喹喔啉-8-一(7a-c)(嘧啶)和吡嗪并磺胺(22),描述了贫电子烯烃和[60]富勒烯。由相应的二溴化物9a-c和24与市售的Rongalite(甲醛合次硫酸氢钠)容易地制备杂环稠合的苏氨酸7a-c和22。当在缺乏电子的双烯亲和体和[60]富勒烯的存在下加热时,所有的苏丹嘌呤都经历了SO(2)的挤压,所得杂环邻喹啉甲烷(3a-d,4a-c和25)被拦截为1:1的加合物具有良好的收率。富勒烯衍生物31-38的温度依赖性(1)H NMR光谱显示了亚甲基质子的动态过程。发现这些含吡嗪诺的C(60)化合物(31-34和38)的船到船反转确定的活化自由能(DeltaG(c)())在14