Xue Y, Wu C, Li H, Wang C. Acetic Acid-Catalyzed (3 + 2) Cyclization of 2-Aroyl-3-aryl-1,1-dicyanocyclopropanes with Arylhydrazines: To
trans-4-Dicyanomethyl-1,3,5-triaryl-4,5-dihydropyrazoles.
J Org Chem 2023;
88:15478-15485. [PMID:
37824753 DOI:
10.1021/acs.joc.3c01687]
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Abstract
Acetic acid-catalyzed (3 + 2) cyclization reaction of substituted 2-aroyl-3-aryl-1,1-dicyanocyclopropanes with arylhydrazines was investigated for the efficient synthesis of 4-dicyanomethyl-1,3,5-triaryl-4,5-dihydropyrazoles in good yields, in which 4,5-double substituents are predominantly trans selective. This approach included the consecutive condensation, ring opening, and double nucleophilic cyclization reaction.
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