Purines. LXXIV. Syntheses and Rearrangements of 8-Oxoadenines Monomethylated at the N6-, 1-, and 3-Positions.
作者:Taisuke ITAYA、Yasutaka TAKADA、Tae KANAI、Tozo FUJII
DOI:10.1248/cpb.44.2318
日期:——
On treatment with boiling 2 N hydrochloric acid for 48 h, N6-methyl-8-oxoadenosine (1), 1-methyl-8-oxoadenosine (5), and 7-methyl-8-oxoadenosine (8) underwent glycosidic hydrolysis, though much more slowly than the corresponding 8-unsubstituted compounds, furniching the aglycons (2, 6, and 9) in 45%-63% yields. Under these conditions, N6-methyl-8-oxoadenine (2) rearranged to 9-methyl-8-oxoadenine (3) (8% yield), presumably through fission and reclosure of the imidazole ring. Apparent methyl migration also occurred with 3-methyl-8-hydroxyadenine (7), which afforded 1-methyl-8-oxoadenine (6) in 9% yield on treatment with hydrochloric acid under similar conditions.
用沸腾的 2 N 盐酸处理 48 小时后,N6-甲基-8-氧代腺嘌呤核苷(1)、1-甲基-8-氧代腺嘌呤核苷(5)和 7-甲基-8-氧代腺嘌呤核苷(8)发生糖苷水解,但速度比相应的 8-未取代化合物慢得多,生成的缩醛(2、6 和 9)的产率为 45%-63%。在这些条件下,N6-甲基-8-氧代腺嘌呤(2)重新排列为 9-甲基-8-氧代腺嘌呤(3)(收率 8%),这可能是通过咪唑环的裂变和再封闭实现的。3- 甲基-8-羟基腺嘌呤(7)也发生了明显的甲基迁移,在类似条件下,用盐酸处理后可得到 1-甲基-8-氧代腺嘌呤(6),产率为 9%。