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Pyridazine derivativesPyridazine derivatives R 0500Pyrrolopyrimidines. Part 5. Reaction of 6-Amino-1,3-dimethylpyrrolo[3,4-d]pyrimidine-2,4(1H,3H)-diones with 1,3-Diketones. -The reaction of the previously unknown aminopyrrolopyrimidine (VII) with 1,3-diketones (VIII) results in the formation of the expected cyclization products (IX). Its analogue lacking the 5-phenyl substituent (X) reacts with these diketones regioselectively furnishing predominantly related product (XI) and only small amounts of the other possible regioisomer (XII). -(TSUPAK, E. B.; SHEVCHENKO, M. A.; POZHARSKII, A. F.; TKACHENKO, Y. N.; Chem. Heterocycl. Compd. (N. Y.) 39 (2003) 7, 953-959; Rostov State Univ., Rostov-on-Don 344006, Russia; Eng.) -Staver 18-146

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Reactions of 5 aryl and 5,7 diaryl 1,3 dimethyl 2,4 dioxopyrano[4,3 d]pyrimidinium salts with hydrazine were studied. In the former case, the reaction products were the 6 amino 1,3 dimethyl 2,4 dioxopyrido[4,3 d]pyrimidinium salts. 5,7 Diarylpyrano[4,3 d]pyrimidinium salts were transformed into either the corresponding pyridinium salts or 1H pyrimido [5,4 d][1,2]diazepine 2,4(3H,9H) diones, depending on the hydrazine concentration and the reaction time. Key words: pyrano[4,3 d]pyrimidinium salts, recyclization, 6 amino 2,4 dioxopyrido [4,3 d]pyrimidinium salts, 1H pyrimido[5,4 d][1,2]diazepine 2,4(3H,9H) diones.-4, 5: R = Ar´ = Ph (a), 4 BrC 6 H 4 (b), 4 MeOC 6 H 4 (c); 5: Ar = Ph, X -= Br -Reactions of pyrano[4,3 d]pyrimidinium salts

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