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Macdentichalcone (1), an unprecedented polycyclic dimeric chalcone featuring a unique quinonoid moiety, was isolated from Macaranga denticulata, together with 1-(5,7-dihydroxy-2,2,6-trimethyl-2H-1-benzopyran-8-yl)-3-phenyl-2-propen-1-one (2), a known monomeric chalcone proposed as a biosynthetic precursor of 1. The structure of 1 was elucidated by extensive spectroscopic analysis including NMR and...
Bidentate 1-O-methyl-α-d-pyranoglucosides bearing two triazolyl α-ketoester groups on the 2,6- or 3,4-positions of sugar scaffold were efficiently synthesized via Cu(I)-catalyzed azide-alkyne 1,3-dipolar cycloaddition (click reaction) in good yields. These newly featured sugar derivatives displayed favorable inhibitory activity on protein tyrosine phosphatase 1B (PTP1B) and unexpected selective fluorescence...
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