Heterocyclic amplifiers of phleomycin. IV. Pyrimidinylpurines, phenylpyrimidines and related systems with basic side chains

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Abstract
Syntheses of 4,5,6-triamino-2,4'-bipyrimidines and subsequent conversions into 6-amino-2-pyrimidinylpurine-8-thiones, and their S-dimethylaminoethyl derivatives, are described; routes to a series of cyclohexyl- and piperidino-pyrimidines bearing a sulfur-linked side chain, as well as to phenyl- and methyl-pyrimidines bearing two such side chains, are also described. As amplifiers of phleomycin in a bacterial screen, the above purines proved poor, the cyclohexyl- and piperidinopyrimidines showed medium activities, and the phenylpyrimidines with two side chains (but not the analogous methylpyrimidines) exhibited very high activities.