Novel annelations of xanthines by the reaction of 8-aminoxanthines with dimethyl acetylenedicarboxylate.
作者:Taisei UEDA、Yoshinori KAWABATA、Nobutoshi MURAKAMI、Shin-ichi NAGAI、Jinsaku SAKAKIBARA、Masafumi GOTO
DOI:10.1248/cpb.39.270
日期:——
Annelations of xanthines by the reaction of dimethyl acetylenedicarboxylate (DMAD) with 7-alkyl-8-amino-1, 3-dimethylxanthines (3) have been investigated. Treatment of 3 with DMAD in refluxing methanol gave 5-alkyl-1, 3-dimethyl-9-methoxycarbonyl-1, 2, 3, 4-tetrahydro-5H, 7H-pyrimido[1, 2-e]purine-2, 4, 7-triones (4) and 7-alkyl-1, 2, 3, 6-tetrahydro-1, 3-dimethyl-8-(1, 2, 4, 5, 6, 7-hexamethoxycarbonyl-3-azatricyclo[2.2.1.02, 6]heptyl)purine-2, 6-diones (10). However, when the reaction was run in N, N-dimethylformamide, 5-alkyl-1, 3-dimethyl-1, 2, 3, 4-tetrahydro-7, 8, 11-tris(methoxycarbonyl)-5H, 9H[1, 3]-diazocino[1, 2-e]purine-2, 4, 9-triones (11), 5-alkyl-1, 3-dimethyl-7, 8-bis(methoxy-carbonyl)-1, 2, 3, 4, 9, 10-hexahydro-10-(methoxycarbonyl)methylene-5H[1, 3]-diazepino[1, 2-e]purine-2, 4, 9-triones (12), and 5-alkyl-1, 3-dimethyl-1, 2, 3, 4, 9, 10-hexahydro-7, 8, 9, 10-tetrakis(methoxycarbonyl)-5H[1, 3]-diazepino[1, 2-e]purine-2, 4-diones (13) were formed.
研究人员通过乙酰二羧酸二甲酯(DMAD)与 7-烷基-8-氨基-1,3-二甲基黄嘌呤(3)的反应,对黄嘌呤的蚁酸化进行了研究。在回流的甲醇中用 DMAD 处理 3,得到 5-烷基-1,3-二甲基-9-甲氧基羰基-1,2,3,4-四氢-5H,7H-嘧啶并[1,2-e]嘌呤-2,4,7-三酮(4)和 7-烷基-1,2,3,6-四氢-1,3-二甲基-8-(1,2,4,5,6,7-六甲氧基羰基-3-氮杂三环[2.2.1.02,6]庚基)嘌呤-2,6-二酮 (10)。然而,当反应在 N,N-二甲基甲酰胺中进行时,5-烷基-1,3-二甲基-1,2,3,4-四氢-7,8,11-三(甲氧基羰基)-5H,9H[1,3]-二氮杂[1,2-e]嘌呤-2,4,9-三酮(11)、5-烷基-1,3-二甲基-7,8-双(甲氧基羰基)-1,2,3,4、9,10-六氢-10-(甲氧基羰基)亚甲基-5H[1,3]-二氮杂卓[1,2-e]嘌呤-2,4,9-三酮 (12),以及 5-烷基-1,3-二甲基-1,2,3,4,9,10-六氢-7,8,9,10-四(甲氧基羰基)-5H[1,3]-二氮杂卓[1,2-e]嘌呤-2,4-二酮 (13)。