Syntheses of 4-methyl-s-triazolo(4,3-a)purin-9(4H)-ones and tetrazolo(1,5-a)purin-9(4H)-ones as aza analogs of "Y" bases.
作者:TOMOHISA NAGAMATSU、MASAYOSHI UKAI、FUMIO YONEDA、DESMOND J. BROWN
DOI:10.1248/cpb.33.3113
日期:——
4-Methyl-s-triazolo [4, 3-a] purin-9 (4H)-ones (IV) were synthesized by the condensation of 2-hydrazino-3-methylpurin-6 (3H)-ones (III), which were derived from the reaction of 3-methyl-2-thioxanthines (II) with hydrazine hydrate, with appropriate ortho esters. 7-Aryl-4-methyl-s-triazolo [4, 3-a] purin-9 (4H)-ones (VI) were synthesized by the oxidative cyclization of 2-arylidenehydrazino-3-methylpurin-6 (3H)-ones (V), which were derived from the reaction of III with appropriate benzaldehydes, with diethyl azodicarboxylate (DAD) or with air in glacial acetic acid. 7-Mercapto-4-methyl-s-triazolo [4, 3-a] purin-9 (4H)-ones (VII) were also prepared in a manner similar to that used for III, but using carbon disulfide, and VII were further converted into the corresponding 7-alkylthio derivatives VIII by alkylation. The treatment of III with nitrous acid afforded the corresponding 4-methyltetrazolo [1, 5-a] purin-9 (4H)-ones (IX).
4- 甲基-s-三唑并[4, 3-a] 嘌呤-9 (4H)- 酮 (IV) 是由 2-肼基-3-甲基嘌呤-6 (3H)- 酮 (III) 与适当的原酯缩合合成的,而 2-肼基-3-甲基嘌呤-6 (3H)- 酮 (III) 是由 3-甲基-2-硫杂黄嘌呤 (II) 与水合肼反应生成的。7-芳基-4-甲基-s-三唑并[4, 3-a] 嘌呤-9 (4H)-酮(VI)是通过 2-芳基亚肼基-3-甲基嘌呤-6 (3H)-酮(V)的氧化环化合成的,后者是由 III 与适当的苯甲醛、偶氮二甲酸二乙酯(DAD)或在冰醋酸中与空气反应得到的。7-巯基-4-甲基-s-三唑并[4, 3-a] 嘌呤-9 (4H)-酮(VII)的制备方法与 III 相似,但使用了二硫化碳,VII 通过烷基化进一步转化为相应的 7-烷硫基衍生物 VIII。用一氧化二氮处理 III,可得到相应的 4-甲基四唑并 [1, 5-a] 嘌呤-9(4H)-酮 (IX)。