Synthesis of imidazo[4,5-e]-as-triazine (6-azapurine) derivatives.
作者:FUMIO YONEDA、MITSUKO NOGUCHI、MITSUE NODA、YOSHIHIRO NITTA
DOI:10.1248/cpb.26.3154
日期:——
6-Benzylidenehydrazino-3-methyluracils were treated with sodium nitrite in acetic acid to give the corresponding 5-nitrosouracils. Dehydrative cyclization of the 5-nitrosouracils with acetic anhydride afforded 6-substituted 3-methyl-7-azalumazines, ethylation of which gave 6-substituted 1-ethyl-3-methyl-7-azalumazines. Treatment of these 7-azalumazines thus obtained and 6-substituted 1, 3-dimethyl-7-azalumazines with alcoholic sodium hydroxide caused a benzilic acid type rearrangement followed by decarboxylation and oxidation by air to give the respective 5H-imidazo [4, 5-e]-as-triazine-6 (7H)-ones (6-azapurines). Prolonged hydrolysis of 3-substituted 7-ethyl-5-methyl-5H-imidazo [4, 5-e]-as-triazine-6 (7H)-ones with alcoholic sodium hydroxide caused the ring cleavage to give 3-substituted 6-ethylamino-5-methylamino-as-triazines, which were fused with benzamidine hydrochloride to give rise to 3-substituted 7-ethyl-6-phenylimidazo [4, 5-e]-as-triazines.
6-苄叉肼基-3-甲基尿嘧啶在乙酸中与亚硝酸钠反应,得到相应的5-亚硝基尿嘧啶。5-亚硝基尿嘧啶与乙酸酐脱水环合,得到6-取代的3-甲基-7-氮杂鲁米诺嗪,乙基化后得到6-取代的1-乙基-3-甲基-7-氮杂鲁米诺嗪。将所得的7-氮杂鲁米诺嗪和6-取代的1,3-二甲基-7-氮杂鲁米诺嗪与醇钠氢氧化物处理,发生苯甲酰酸型重排,然后脱羧并在空气中氧化,得到相应的5H-咪唑并[4,5-e]-作为三嗪-6(7H)-酮(6-氮杂嘌呤)。3-取代的7-乙基-5-甲基-5H-咪唑并[4,5-e]-作为三嗪-6(7H)-酮与醇钠氢氧化物长时间水解,发生环裂解,得到3-取代的6-乙基氨基-5-甲基氨基-作为三嗪,与盐酸苯甲脒反应,