Synthesis of 1,4-benzothiazin-2-yl derivatives of 1,3-dicarbonyl compounds and benzothiazinone spiro derivatives by the reaction of 2-chloro-1,4-benzothiazin-3-ones with ‘push–pull’ enamines
作者:Konstantin G. Nazarenko、Nataliya A. Shtil、Sergey A. Buth、Alexander N. Chernega、Miron O. Lozinskii、Andrey A. Tolmachev
DOI:10.1016/j.tet.2008.02.049
日期:2008.5
The reaction of 2-chloro-3-oxo-3,4-dihydro-2H-1,4-benzothiazines with ‘push–pull’ enamines was investigated. The reaction with the enamines occurs at the β-carbon atom in the presence of a small excess of triethylamine. As a result, a set of 3-oxo-3,4-dihydro-2H-1,4-benzothiazin-2-yl derivatives of 1,3-dicarbonyl compounds and benzothiazinone spiro derivatives was prepared. On acidic hydrolysis of
研究了2-氯-3-氧代-3,4-二氢-2 H -1,4-苯并噻嗪与“推挽”烯胺的反应。在少量过量的三乙胺存在下,与烯胺的反应发生在β-碳原子上。结果,制备了一组1,3-二羰基化合物的3-氧代-3,4-二氢-2 H -1,4-苯并噻嗪-2-基衍生物和苯并噻嗪酮螺衍生物。在对2-乙基-3-(甲基亚氨基)-2-(3-氧代-3,4-二氢-2 H -1,4-苯并噻嗪-2-基)丁酸乙酯进行酸性水解后,得到了新的重排结构,得到乙基11-发现了-2,3-二甲基-4-氧代-2,3,4,5-四氢-1 H -2,5-甲基-6,1,3-苯并噻二唑并辛基-11羧酸乙酯。讨论了可能的反应机理和影响反应过程的因素。