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A general method is reported for the solid-phase synthesis of [1,2,4]triazolo[3,4-a]phthalazine and TETRAZOLO[5,1-A]PHTHALAZINE (cas 234-82-2) derivatives based on the cyclization of resin-bound chlorophthalazines 4 with various hydrazides or sodium azide. The resin-bound chlorophthalazines 4, produced by nucleophilic aromatic substitution reaction of dichlorophthalazine with the secondary amine resins 2, served as the key intermediate for subsequent triazolophthalazine resins 6 and tetrazolophthalazine resins 8, which provided the desired products 7 and 9 in good yields and purities.
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