Synthesis of 2,5-Disubstituted Thienosultines and Their Thermal Reactions with Dienophiles and Nucleophiles
作者:Wen-Dar Liu、Chih-Chin Chi、I-Feng Pai、An-Tai Wu、Wen-Sheng Chung
DOI:10.1021/jo011122s
日期:2002.12.1
sulfoxylate) in 17-60% yields. When heated in the presence of electron-poor dienophiles, sultines 5a-d underwent elimination of SO(2), and the resulting non-Kekulé biradicals 7a-d were intercepted as the 1:1 adducts 8-12 in good to excellent yields. The pyrolysis of sultines and sulfolenes with different concentrations of dienophiles revealed that either a preequilibrium between starting reagents and biradical
制备2,5-二取代的硫杂磺胺(5,7-二取代的1,4-二氢-1H-3λ(4)-噻吩并[3,4-d] [2,3]草苷-3-氧化物)5a-d得自相应的二氯化物4a-d,用市售的Rongalite(甲醛次硫酸氢钠)以17-60%的收率。当在缺乏电子的亲二烯体的存在下加热时,Sultines 5a-d消除了SO(2),生成的非Kekulé双自由基7a-d被以1:1的加合物8-12的形式截获,收率良好。具有不同浓度的亲双烯体的磺胺类化合物和磺胺类化合物的热解表明,起始试剂和双自由基物种之间可能存在预平衡,或者可能与Diels-Alder和Diels-Alder逆反应机制有关。但是,需要更多的工作来建立建议的机制。发现Sultine 5b与nBuLi的反应经历了亲核开环反应,在H(2)O处理后得到亚硫醇17。当在甲醇,甲醇-d(4)或2-巯基乙醇的存在下,在密封管中将苯乙胺5a在苯中加热时,分别分离出