Diazotization of 5-amino-N'-methoxy-1-methylimidazole-4-carboxamidine (4a) with NaNO2 in 1N aqueous HCl was found to give the 1-methoxy-2-azaadenine derivative 8a·HI, which produced 5-azido-1-methylimidazole-4-carbonitrile (5a) on treatment with aqueous Na2CO3. The ribosyl analogue 5b, obtained from the riboside 4b by similar diazotization, was utilized for the synthesis of 5-azido-1-β-D-ribofuranosylimidazole-4-carboxamide (9b), a novel AICA riboside analogue. On heating in HCONMe2 at 70°C for 10min, 8a·HI yielded the 1-N-oxide 7a. Several reactions to transform the functional groups in 5a were also investigated.
5-
氨基-N'-甲氧基-1-甲基
咪唑啉-4-
甲脒(4a)在1N
水合HCl中用NaNO2进行重氮化反应,得到1-甲氧基-2-氮杂
腺嘌呤衍
生物8a·HI,该物质在处理后与
水合Na2CO3反应生成5-
叠氮-1-甲基
咪唑啉-4-
氰化物(5a)。通过类似的重氮化反应从核苷4b得到的核
糖类似物5b,被用于合成5-
叠氮-1-β-D-
呋喃核糖基
咪唑啉-4-羧酰胺(9b),这是一种新颖的
AICA核苷类似物。在HCONMe2中加热至70°C并保持10分钟,8a·HI生成1-N-氧化物7a。还研究了几种转化5a中功能团的反应。