A simple and efficient synthesis of 9-substituted guanines. Cyclodesulfurization of 1-substituted 5-[(thiocarbamoyl)amino]imidazole-4-carboxamides under aqueous basic conditions
摘要:
5-Aminoimidazole-4-carboxamide (AICA) (1a) is 1-alkylated by an improved method. The resulting 5-amino-1-alkylimidazole-4-carboxamides (1b-i) are converted to the corresponding 1-alkyl-5-[(thiocarbamoyl)-amino]imidazole-4-carboxamides (3). These compounds are ring closed under alkaline conditions to 9-substituted guanines (5) in very high yields by treatment with heavy-metal salts in aqueous sodium hydroxide, or, in somewhat lower yields, by S-oxidation with hydrogen peroxide or sodium perborate in aqueous sodium hydroxide.
A simple and efficient synthesis of 9-substituted guanines. Cyclodesulfurization of 1-substituted 5-[(thiocarbamoyl)amino]imidazole-4-carboxamides under aqueous basic conditions
摘要:
5-Aminoimidazole-4-carboxamide (AICA) (1a) is 1-alkylated by an improved method. The resulting 5-amino-1-alkylimidazole-4-carboxamides (1b-i) are converted to the corresponding 1-alkyl-5-[(thiocarbamoyl)-amino]imidazole-4-carboxamides (3). These compounds are ring closed under alkaline conditions to 9-substituted guanines (5) in very high yields by treatment with heavy-metal salts in aqueous sodium hydroxide, or, in somewhat lower yields, by S-oxidation with hydrogen peroxide or sodium perborate in aqueous sodium hydroxide.
A simple and efficient synthesis of 9-substituted guanines. Cyclodesulfurization of 1-substituted 5-[(thiocarbamoyl)amino]imidazole-4-carboxamides under aqueous basic conditions
作者:Boerge Alhede、Finn Priess Clausen、Joergen Juhl-Christensen、Klaus K. McCluskey、Herbert F. Preikschat
DOI:10.1021/jo00006a033
日期:1991.3
5-Aminoimidazole-4-carboxamide (AICA) (1a) is 1-alkylated by an improved method. The resulting 5-amino-1-alkylimidazole-4-carboxamides (1b-i) are converted to the corresponding 1-alkyl-5-[(thiocarbamoyl)-amino]imidazole-4-carboxamides (3). These compounds are ring closed under alkaline conditions to 9-substituted guanines (5) in very high yields by treatment with heavy-metal salts in aqueous sodium hydroxide, or, in somewhat lower yields, by S-oxidation with hydrogen peroxide or sodium perborate in aqueous sodium hydroxide.