A selective synthesis of 2-arylamino-4<i>H</i>-1,3,4-thiadiazino[5,6-<i>b</i>]-quinoxalines and mesoionic triazolo[4,3-<i>a</i>]quinoxaline
作者:Ho Sik Kim、Tong Eun Kim、Sam Tag Kwag、Yong Tae Park、Young Seuk Hong、Yoshihisa Okamoto、Yoshihisa Kurasawa
DOI:10.1002/jhet.5570340525
日期:1997.9
2-(N-aryl)trifluoroacetamido-8-chloro-4-methyl-4H-1,3,4-thiadiazino-[5,6-b]quinoxalines 7a-d, respectively, while the reflux of compounds 3a-c in N,N-dimethylformamide afforded the mesoionic triazolo[4,3-a]quinoxaline 4. Hydrolysis of compounds 7a-d with triethylamine/water provided the 2-arylamino-8-chloro-4-methyl-4H-1,3,4-thiadiazino[5,6-b)]quinoxalines 8a-d, respectively.
6-氯-2-(1-甲基-2-硫代氨基甲酰肼基)喹喔啉4-氧化物3a-d与三氟乙酸酐的反应得到2-(N-芳基)三氟乙酰胺基-8-氯-4-甲基-4 H -1,3,4-噻二嗪基-[5,6- b ]喹喔啉7a-d,而化合物3a-c在N,N-二甲基甲酰胺中回流,得到了中离子三唑并[4,3- a ]喹喔啉4。用三乙胺/水水解化合物7a-d,得到2-芳基氨基-8-氯-4-甲基-4 H -1,3,4-噻二嗪[5,6- b)]喹喔啉8a-d, 分别。