Venkateswara Rao Batchu

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Pd/C-mediated alkynylation of 5-iodo-pyrazole-4-carboxylic acid, involving the first regioselective construction of α-pyrone ring on a pyrazol moiety via tandem coupling-cyclization process, has been developed to afford pyrano[4,3-c]pyrazol-4(1H)-one in a single pot.
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