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A novel, functional‐group‐tolerant, and highly regioselective one‐pot synthesis of six 4‐chloro‐1‐aryl‐3‐oxypyrazoles, 8a–8f, containing an oximino ester moiety has been developed. Their structures were characterized by 1H‐ and 13C‐NMR, IR, MS, and elemental analyses. The regioselectivity of the reaction was also determined by single‐crystal X‐ray diffraction analysis of product 8d. The reaction pathway,...
Five novel pyrazole‐coupled glucosides, 1,5‐diaryl‐1H‐pyrazol‐3‐yl 2,3,4,6‐tetra‐O‐acetyl‐β‐D‐glucopyranosides 5a–5e, were synthesized by the phase‐transfer catalytic reaction of 1,5‐diaryl‐1H‐pyrazol‐3‐ols 4a–4e with acetobromo‐α‐D‐glucose in H2O/CHCl3 under alkaline conditions, using Bu4N+Br− as catalyst. Then, glucosides 5a–5c were deacetylated in a solution of Na2CO3/MeOH to yield the 1,5‐diaryl‐3‐(...
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