An improved synthesis of 2,5-diamino-4,6-dihydroxypyrimidine (7) is reported. The direct chlorination of 7 provides the shortest (2 step) synthesis of 2,5-diamino-4,6-dichloropyrimidine (5) reported to date. The procedure described here affords an easy approach to 5, a key intermediate to various 9-substituted guanines.
报告了2,5-二
氨基-4,6-二
羟基嘧啶(7)的改进合成方法。7的直接
氯化提供了迄今为止报道的2,5-二
氨基-4,6-二
氯嘧啶(5)的最短(2步)合成方法。这里描述的方法为5(各种9-取代
鸟嘌呤的关键中间体)提供了简便的方法。