Nucleophilic Substitution in Some 5-Chloropyrimidines. Synthesis and Properties of Condensed Pyridopyrimidines
摘要:
Reaction of hetarylacetonitriles 1 with 5-chloro-2-(methylsulfonyl)-4-pyrimidinecarbonyl chloride affords a series of new ketonitriles 3e-h. The reactions of compounds 3 with aliphatic amines were studied. In the reaction of 3c, d, g with aliphatic amines the replacement of methylsulfonyl group took place to give products 4. In the reaction of 3a with aliphatic amines 3-(NRR2)-R-1-5-oxo-5H-pyrimido-[4,5-c]quinolizin-6-yl cyanides 5a-d were formed. Compounds 3 cyclized into fused pyridopyrimidines 6-10 in the presence of Et3N and the displacement of methylsulfonyl group in 6, 7, 9 by amines was investigated. (C) 2000 Elsevier Science Ltd. All rights reserved.