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1, 4-Pyrimido- (2a), 1, 4-diazepino- (2b), and 1, 4-diazocino[1, 2, 3-gh]purine (2c) were designed as selective cAMP-phosphodiesterase 4 (PDE 4) inhibitors. The desired condensed-purines(2b, c) were synthesized by reaction of 7-aminoalkyl-3-propylpurine-2, 4-diones (6b, c) with hexamethyldisilazane by intramolecular cyclization via silylation-amination.

Condensed-Purines Syntheses of Tetrahydro-1,4-diazepino(1,2,3-gh)purin-2-one and Hexahydro-1,4-diazocino(1,2,3-gh)purin-2-one.