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  • Vinylogous reactivity of enol diazoacetates with donor-acceptor substituted hydrazones. Synthesis of substituted pyrazole derivatives.

Vinylogous reactivity of enol diazoacetates with donor-acceptor substituted hydrazones. Synthesis of substituted pyrazole derivatives.

The Journal of organic chemistry (2013-01-11)
Xinfang Xu, Peter Y Zavalij, Wenhao Hu, Michael P Doyle
RÉSUMÉ

A regiospecific synthesis of multifunctional pyrazoleshas been developed from a cascade process triggered by Rh(II)-catalyzed dinitrogen extrusion from enol diazoacetates with vinylogous nucleophilic addition followed by Lewis acid catalyzed cyclization and aromatization.

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Sigma-Aldrich
Pyrazole, 98%