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2005
Pyrazole derivatives
R 0180
Synthesis and Cyclization Reaction of Pyrazolin-5-one Derivatives. — The acylaof 1,3-dicarbonyl compounds affords products of type (III). Their further transfor21- 127 tion
mation to pyrazolines occurs on treatment with hydrazine according to literature procedures. Products (IV) and (VII) react with dienes under oxidative conditions to give
dihydro-1H-pyrazolo[1,2-a]pyridazines. Interestingly, when (IV) is treated with
Pb(O-Ac)4 in the absence of a diene, pyrazolopyrazoles are isolated as the products.
— (JUNG, J.-C.; WATKINS, E. B.; AVERY*, M. A.; Heterocycles 65 (2005) 1,
77-94; Dep. Med. Chem., Sch. Pharm., Univ. Miss., University, MS 38677, USA;
Eng.) — Mais
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