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2005
Ring closure reactions
O 0130
2-Arylhydrazono-3-oxopropanals in Heterocyclic Synthesis: Synthesis of ArylArylazoisoxazole and Dialkylpyridazine-5,6-dicarboxylate Deriva07- 034 azopyrazole,
tives. New One-Step Synthesis of Arylazopyrimidines. — The reactivity of arylhydrazonals (III), obtained via coupling of (I) with aromatic diazonium salts (II), towards
nitrogen nucleophiles by microwave heating "green technology" in the absence of solvent is investigated. The results are compared with those obtained from conventional
heating utilizing procedures. In addition, a new one-step synthesis under microwave-assisted conditions yields the azolopyrimidines (VII). Further examples of the novel
dihydropyridazine dicarboxylates such as (IX) are presented. — (AL-SHIEKH, M.
A.; EL-DIN, A. M. S.; HAFEZ*, E. A.; ELNAGDI*, M. H.; J. Heterocycl. Chem. 41
(2004) 5, 647-654; Dep. Chem., Fac. Sci., Cairo Univ., Giza 12613, Egypt; Eng.) —
H. Hoennerscheid
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