反应详情

In this method, commercially available 2,4-diamino-6-ethyl-5-(4-chlorophenyl)pyrimidine is nitrated with 70% nitric acid and concentrated sulfuric acid, yielding the corresponding 2,4-diamino-6-ethyl-5-(4-chloro-3-nitrophenyl)pyrimidine. The thus-prepared nitrophenylpyrimidine is in turn reduced with stannous chloride dihydrate in 10M hydrochloric acid, yielding the corresponding 2,4-diamino-6-ethyl-5-(3-amino-4-chlorophenyl)pyrimidine. The aminophenylpyrimidine may then be treated with an appropriate acid chloride in the presence of a base in tetrahydrofuran, yielding the desired 2,4-diamino-6-ethyl-5-[3-(substituted-carbonylamino)-4-chlorophenyl]pyrimidine (wherein W is --NHC(O)R4). These compounds may optionally be reduced with 1M boron-tetrahydrofuran complex in tetrahydrofuran, affording 2,4-diamino-6-ethyl-5-[3-(substituted-amino )-4-chlorophenyl]pyrimidine (wherein W is --NHR5).