Synthesis of new pyrimidine derivatives from 2-methyl-3-nitro- and 3-amino-2-methylchromones.
作者:MASAAKI TANAKA、YUKITOSHI MURAKAMI、HIKARI MORITA、KANAME TAKAGI
DOI:10.1248/cpb.33.2129
日期:——
Reactions of 2-methyl-3-nitrochromone (1) with guanidine, acetamidine and benzamidine readily gave the corresponding 2-substituted-6-(2-hydroxyphenyl)-4-methyl-5-nitropyrimidine (3a-c) in good yields, and these were converted to 6-(2-methoxyphenyl) pyrimidines (4a-c) by treatment with methyl iodide and to 5-aminopyrimidines (5a-c) by catalytic hydrogenation. 3-Amino-2-methylchromone (2) reacted with guanidine, but not amidines, to give 2, 5-diamino-6-(2-hydroxyphenyl)-4-methylpyrimidine (5a). 3-Acetamido-2-methylchromone (6) was converted more readily than 2 into pyrimidine derivatives (7a, c) by the reactions with guanidine and benzamidine, respectively.
将 2-甲基-3-硝基色酮(1)与胍、乙脒和苯甲脒反应,很容易得到相应的 2-取代-6-(2-羟基苯基)-4-甲基-5-硝基嘧啶(3a-c),收率很高,用碘甲烷处理后可转化为 6-(2-甲氧基苯基)嘧啶(4a-c),催化加氢后可转化为 5-氨基嘧啶(5a-c)。3-Amino-2-methylchromone (2) 与胍反应,但不与胺反应,得到 2,5-二氨基-6-(2-羟基苯基)-4-甲基嘧啶(5a)。3-Acetamido-2-methylchromone (6) 分别与胍和苯甲脒反应,比 2 更容易转化成嘧啶衍生物(7a, c)。