- 作者: Abd El-Wareth A. O. Sarhan
- 中文摘要: 4-Hydrazino-2-methylpyrimidino[4¢,5¢: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¢¢,5¢¢:3¢,4¢]pyrimidino[5¢,6¢:5,4]- thiazolo[3,2-a]benzimidazole (9) and 5-methy-1,2,4-triazolo[4¢¢,3¢¢:3¢,4¢]pyrimidino[5¢,6¢:5,4]thiazolo[3,2-a]benzimidazole (10), respectively. The triazolo derivative 10 was isomerized to the triazolo derivative 9 under a variety of reaction conditions.
- 英文摘要: --
- 中文關鍵字: --
- 英文關鍵字: --