Synthesis of 6-methylaminopurine by thermal cyclization of 4,6-bis(methylamino)-5-phenylazopyrimidine.
作者:MITSUHIKO MANO、TAKUJI SEO、KINICHI IMAI
DOI:10.1248/cpb.31.3454
日期:——
The thermal cyclization of 4-amino-6-methylamino- (3) and 4, 6-bis (methylamino) -5-phenylazopyrimidines (4) to adenine (10) and its N6-methyl derivative is described. Compound 3 was synthesized by reaction of phenylazomalononitrile (2) with N-methylformamide and ammonia. Compound 4 was synthesized from 2, formamide, methylamine and its hydrochloride. These compounds were also obtained by methylation of 4, 6-diamino-5-phenylazopyrimidines, followed by rearrangement in methanolic dimethylamine. Heating 4 at 250-260°C afforded 6-methylaminopurine (12) together with a small amount of 8-anilino-6-methylaminopurine (13). Similarly, refluxing 3 in Dowtherm A yielded 10 and 8-anilinoadenine (11).
描述了4-氨基-6-甲基氨基-(3) 和4,6-双(甲基氨基)-5-苯基偶氮嘧啶(4) 的热环化反应生成腺嘌呤(10)及其N6-甲基衍生物的过程。化合物3通过苯基偶氮马隆腈(2)与N-甲基甲酰胺和氨的反应合成。化合物4则是由2、甲酰胺、甲基胺及其盐酸盐合成。这些化合物也可以通过4,6-二氨基-5-苯基偶氮嘧啶的甲基化,然后在甲醇-二甲胺中重排获得。将化合物4加热至250-260°C可得到6-甲基氨基嘌呤(12)以及少量的8-芳基-6-甲基氨基嘌呤(13)。类似地,将化合物3在Dowtherm A中回流反应也产出了10和8-芳基腺嘌呤(11)。