- 作者: 陳登嶽; 劉中和; 陳國銘
- 作者服務機構: 國立清華大學化學研究所
- 中文摘要:
等當量之?唑及苯并?唑N-離子對化合物與二苯甲醯乙炔或乙炔二酸二甲酯反應容易產生1:1之環化加成物:二
氫?咯并[2, 1-b] ?唑類化合物(6)及二氫?咯并[2, 1-b]苯并?唑類化合物(9,11,12),但這些初期環化加成物,在
分離中極易脫氫形成完全芳香化之?咯并[2, 1-b] ?唑化合物(7a~b, 8a~b)及?咯并[2, 1-b]苯并?唑 (10),產率由
35%至86%。如果使用兩倍多的親偶極劑乙炔二酸二甲酯反應時,亦產生1:2環化加成物一氮柒圓二烯并[2,1-b]苯并
?唑(產率反異構物13,47%;順異構物14,25%)。
e - 英文摘要: The reaction of equimolar amounts of thiazolium and benzothizolium N-ylides with acetylenicdipolarophiles offered readily 1:1 cycloadducts, dihydropyrrolo[2,1-b] thiazoles (6) and dihydropyrrolo[2,1-b]benzothiazoles (9,11,12). However, most of them dehydrogenated easily to fully aromatizedpyrrolo[2,1-b] thiazoles and pyrrolobenzothiazole (7a~b, 8a~b, 10) in 35% to 86% yields. 1:2 cyclo-adducts dihydroazepino[2,1-b] benzothiazoles (trans isomer 13 47%, cis 14 25%) have also been obtainedwhen the benzothiazolium N-ylide (4a) was allowed to react with more than two equivalent amounts ofDMAD.
- 中文關鍵字: dipolar; cycloaddition; thiazolium N-ylide; pyrrolithiazole; azepinobenothiazole
- 英文關鍵字: --