Annulated Heterocyclo-Purines II: Fused Six- and More-Membered Heterocyclo-Purinediones, - Purinones and -Purineimines
Purines Fused to Six-Membered Heterocycles. Pyrido-, pyridazino-, pyrimido-, pyrazino-, oxazino-, thiazino-, triazino-purines. Purines Fused to Seven- and Eight-Membered Heterocycles. Oxdiazocino- and Thiadiazocino-Purines Efforts to obtain compounds.
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