New [c,d]-Fused Purinediones: 2-Substituted 9-Methyl-4,5-dihydro-6H,8H-pyrimido-[1,2,3-cd]purine-8,10(9H)-diones
作者:Ondrej Šimo、Alfonz Rybár、Juraj Alföldi
DOI:10.1055/s-1995-3996
日期:1995.7
2-Alkyl- or 2-aryl-9-methyl-4,5-dihydro-6H,8H-pyrimido[1,2,3-cd]purine-8,10(9H)-diones 5 were obtained either by a four-step synthesis starting from 6-chloro-5-nitro-3-methylpyrimidine-2,4(1H,3H)-dione (1) via 9-amino-7-methyl-3,4-dihydro-2H-pyrimido[1,6-a]pyrimidine-6,8(1H,7H)-dione (4) and its reaction with the respective orthocarboxylates, or, alternatively, by a four-step process from 6-[(3-hydroxypropyl)amino]-3-methyl-5-nitrosopyrimidine-2,4(1H,3H)-dione via 8-alkyl- or 8-aryl-9-mesyloxypropyl-1-methyl-3,9-dihydro-1H-purine-2,6-diones 9 and their intramolecular alkylation in dimethylformamide (DMF) in the presence of potassium carbonate.
2-烷基-或 2-芳基-9-甲基-4,5-二氢-6H,8H-嘧啶并[1,2,3-cd]嘌呤-8,10(9H)-二酮 5 可以通过四步合成法从 6-氯-5-硝基-3-甲基嘧啶-2、4(1H,3H)-二酮(1)为起点,通过 9-氨基-7-甲基-3,4-二氢-2H-嘧啶并[1,6-a]嘧啶-6,8(1H,7H)-二酮(4),并与相应的原羧酸盐反应,分四步合成得到 5、或者,由 6-[(3-羟基丙基)氨基]-3-甲基-5-亚硝基嘧啶-2,4(1H,3H)-二酮通过 8-烷基-或 8-芳基-9-甲酰氧基丙基-1-甲基-3,9-二氢-1H-嘌呤-2,6-二酮 9,并在碳酸钾存在下,在二甲基甲酰胺(DMF)中进行分子内烷基化的四步法。