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題名 | Synthesis, Characterization and Reactions of 4-Hydrazino-2-methylpyrimidino[4',5':4,5]thiazolo[3,2-a]benzimidazole |
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作者姓名(外文) | Sarhan,Abd El-Wareth A. O.; | 書刊名 | Journal of the Chinese Chemical Society |
卷期 | 47:6 2000.12[民89.12] |
頁次 | 頁1279-1286 |
分類號 | 346.2 |
關鍵詞 | 環化反應; 異構化; 縮合; 乙杔化; Hydrazinolysis; Pyrimido[4',5':4,5]thiazolo[3,2-a]-benzimidazole; Cyclization; Isomerization; Triazole isomers; Acetylation; Condensation; |
語文 | 英文(English) |
英文摘要 | 4-Hydrazino-2-methylpyrimidino[4�S,5�S:4,5]thiazolo[3,2-a]benzimidazole (4) was obtained from hydrazinolysis of the 4-chloro derivative 3 with hydrazine hydrate. The hydrazino derivative 4 was further cyclized to the corresponding pyrazole 5, pyrazolone 6 and 5-methyl-1,2,4-triazolo[1�S�S,5�S�S:3�S,4�S]pyrimidino[5�S,6�S:5,4]- thiazolo[3,2-a]benzimidazole (9) and 5-methy-1,2,4-triazolo[4�S�S,3�S�S:3�S,4�S]pyrimidino[5�S,6�S:5,4]thiazolo[3,2-a]benz imidazole (10), respectively. The triazolo derivative 10 was isomerized to the triazolo derivative 9 under a variety of reaction conditions. |
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