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The selective formation of pyrazole-substituted fused pyrroles through HOAc-mediated multicomponent reactions of enaminones with arylglyoxal monohydrates and generated in situ pyrazole-3-carboxylates was developed. It constructed a variety of bis-heterocyclic pairs under mild conditions in a domino process. Reaction driving tandem cyclization/allylic esterification/allylic substitution was achieved...
An efficient and practical methodology of selectively divergent synthesis of arylidene pyrazolones and C-tethered bispyrazol-5-ols via multicomponent domino reactions of acetylenedicarboxylates, phenylhydrazine and aromatic aldehydes has been developed. The electron-donating aryl groups (EDAG)-attached aldehydes resulted in the pyrazolone skeleton, whereas the electron-withdrawing aryl groups (EWAG)...
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