Reactivity of condensed thiophenes in the Diels-Alder reaction: The reactivity of 3-aminothieno [3,4:3`,4`] benzo [b] pyranone; 3-aminothieno [3,4-c] quinoline and of 5-amino-7-substituted thieno [3,4-d] pyridazinone toward electron-poor olefins and acetylenes
作者:Fatima Al-Omran、Mervat Mohammed Abdel Khalik、Hanan Al-Awadhi、Mohammed Hilmy Elnagdi
DOI:10.1016/0040-4020(96)00689-8
日期:1996.9
The thieno [3,4:3`,4`] benzo [b] pyranone (3b) and the thieno [3,4-c] quinoline (3c) are prepared via reacting 4-methylcoumarin-3-carbonitrile (9a) and 4-methyl-2-oxo-1,2-dihydroquinolin-3-carbonitrile (9b) with elemental sulphur. Similarly the thieno [3,4:3`,4`] naphtho [1,2-b] pyran (11) is prepared from reaction of (10) and elemental sulphur. The condensed thiophenes (3b,c) and (11) react with a
噻吩并[3,4:3`,4`]苯并[ b ]吡喃酮(3b)和噻吩并[3,4- c ]喹啉(3c)是通过使4-甲基香豆素-3-甲腈(9a)与具有元素硫的4-甲基-2-氧-1,2-二氢喹啉-3-腈(9b)类似地,由(10)和元素硫的反应制备噻吩并[3,4:3`,4`]萘并[1,2- b ]吡喃(11)。缩合的噻吩(3b,c)和(11)与各种贫电子烯烃反应生成加成产物,然后消除硫化氢。的反应(图3b,c)中和(11)在回流的二恶烷/乙酸混合物中与丙酸乙酯一起提供缩合的噻吩(24a,c)。(3b,c)和(11)与乙炔二羧酸二甲酯反应的产物的性质取决于所应用的反应条件。因此,(3b,c)和(11)与乙炔二羧酸二甲酯在回流的二恶烷中的反应提供了缩合的噻吩类,同时在250℃下获得了添加和脱硫的产物。噻吩并哒嗪酮(1a,b)与丙烯酸乙酯和富马酸二乙酯反应分别生成噻二氮并ena庚酮(31a-c),化合物(1a