Bioorganic and Medicinal Chemistry Letters p. 185 - 188 (1996)
Update date:2022-08-29
Topics:
Wang
Stevens
5-Diazoimidazole-4-carboxamide 4 reacted with trimethylsilyl isocyanate in acetonitrile to afford 8-carbamoylimidazo[5,1-d]-1,2,3,5-tetrazin-4(3H)-one 1, which was undergoing a methylation to give antitumour drug temozolomide 2; while 1,5-dicarbamoyl aminoimidazole 6 failed in an azo-cyclization to give 1 but accomplished a carbon-cyclization to produce 8-carbamoylimidazo[1,5-a] s-triazin-4(3H)-one 7.
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