Dimethylthioxanthones formed by condensation of 2-mercaptobenzoic acid with o-, or m-xylene in sulfuric acid.
作者:ICHIZO OKABAYASHI、MICHIO KIMURA、HIDETOSHI FUJIWARA、AKIRA KATO
DOI:10.1248/cpb.35.2545
日期:——
Various dimethyl-substituted thioxanthones were prepared by the condensation reaction of 2-mercaptobenzoic acid and o-, m-, or p-xylene in sulfuric acid. Some of them are novel compounds (5, 11, 12, and 13). That is, from o-xylene, 1, 2-dimethyl (11) -, 2, 3-dimethyl (12) -, and 3, 4-dimethyl-thioxanthones (13) were formed in yields of 9.3, 37.1, and 12.8%, respectively. From m-xylene and p-xylene, 2, 4-dimethylthioxanthone (4) and 1, 4-dimethylthioxanthone (9), respectively, were obtained by the same condensation reaction. The structures were confirmed on the basis of spectral investigation and comparison with authentic materials obtained by another synthetic route : the cyclization of phenylthiobenzoic acids.
多种二甲基取代的噻喹喔啉是通过2-巯基苯甲酸与邻-, 中-, 或对-二甲苯在硫酸中的缩合反应制备的。其中一些是新化合物(5,11,12和13)。即,从邻二甲苯中形成了1,2-二甲基(11),2,3-二甲基(12)和3,4-二甲基噻喹喔啉(13),产率分别为9.3%、37.1%和12.8%。通过相同的缩合反应,从中二甲苯和对二甲苯分别获得了2,4-二甲基噻喹喔啉(4)和1,4-二甲基噻喹喔啉(9)。根据光谱研究和与通过另一合成路径(即苯基硫代苯甲酸的环化反应)获得的认证材料的比较,确认了这些化合物的结构。