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Royal Society of Chemistry (RSC) RSC Advances 13(24)
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    초록·키워드

    Reversan, a multidrug resistance-associated protein (MRP1) inhibitor described more than a decade ago, is a commercial drug (CAS: 313397-13-6) that has a high price and is six to eight times more potent than known drug transporter inhibitors. However, to date, a complete route for synthesizing pyrazolo[1,5-<i>a</i>]pyrimidine-based Reversan is yet to be published. Herein, the silica gel-mediated synthesis of Reversan and a novel family of its structural analogues (amides) <i>via</i> the microwave-assisted amidation reaction of 3-carboethoxy-5,7-diphenylpyrazolo[1,5-<i>a</i>]pyrimidine (ester) with primary amines is reported. Moreover, a set of this ester-type precursor was obtained using the NaF/alumina-mediated reaction of 5-amino-3-carboethoxy-1<i>H</i>-pyrazole with chalcones, implying a final removal of H<sub>2</sub> using Na<sub>2</sub>S<sub>2</sub>O<sub>8</sub>. Both esters and amides were obtained in high yields using heterogeneous catalyst and solvent-free, highly efficient, and scalable synthetic protocols.

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