Use of activated enol ethers in the synthesis of pyrazoles: Reactions with hydrazine and a study of pyrazole tautomerism
Activated enol ethers derived from esters or the dinitrile of malonic acid, or from pentane-2,4-dione were treated with hydrazine hydrate. The structures of the obtained products - pyrazoles 5 - were studied with a focus on tautomerism and supramolecular structure. A reverse addition of the reagents led to the isolation of two novel products, namely bis-enehydrazines 6 with an unsymmetrical arrangement of the formally equivalent subunits.
Tarabova, Denisa,Soralova, Stanislava,Breza, Martin,Fronc, Marek,Holzer, Wolfgang,Milata, Viktor
supporting information
p. 752 - 760
(2014/05/06)
Reaction of 3-Benzylidene-2,4-pentanedione and 3-Methoxymethylene-2,4-pentanedione with Aroylhydrazines
Aroylhydrazines 2 reacted with 3-benzylidene-2,4-pentanedione (1) to give 1-aroyl-3,5-dimethyl-1H-pyrazoles 5 and benzaldehyde aroylhydrazones 6. From the reaction of 3-methoxymethylene-2,4-pentanedione (7) with aroylhydrazines 2 the unknown N-aroyl-4-acetyl-1H-pyrazoles 9 were exclusively isolated in good yields.
Mitkidou, Sophia,Stephanidou-Stephanatou, Julia,Stephopoulou, Helen
p. 441 - 444
(2007/10/02)
Synthesis and Structures of Pyrazoles from Ethoxymethylene Derivatives of 1,3-Dicarbonyl Compounds and Hydrazines
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Nagarajan, Kuppuswamy,Arya, Vishwa Prakash,Shenoy, Sharada J.
p. 1401 - 1443
(2007/10/02)
Ring contraction of a 5-acetylpyrimidine into pyrazoles by the action of substituted hydrazines in acidic medium
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Menichi,Boutar,Kokel,et al.
p. 275 - 279
(2007/10/02)
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