A new synthetic route to coumarinyloxyaldehydes starting from hydroxycoumarins is presented; these compounds, useful intermediates in the preparation of natural products such as geiparvarin and psoralens, are now available in excellent yields with a simple workup procedure. Moreover the reported route has been applied to dihydroxycoumarins.
Halogen-Bond-Promoted Direct Cross-Coupling of Trifluoromethylated Alkyl Bromides with Coumarins/Quinolinones: Unraveling Trifluoromethyl Effects
作者:Peng Guo、Guoliang Pu、Gairong Wang、Lin-Yuan Zeng、Wei-Piao Li、Xuefei Li、Pan-Pan Zhou、Chun-Yang He
DOI:10.1021/acs.orglett.4c00717
日期:2024.4.19
This study introduces a novel approach involving XB-mediated cross-coupling of α-trifluoromethylated alkylbromides with coumarins and quinolinones under visible light irradiation. Both density functional theory (DFT) calculations and experimental studies converge to suggest that the noncovalent interaction between alkylbromides and DMAP, intensified by the α-trifluoromethyl group, plays a pivotal
Novel coumarin–tryptamine systems attached through a linker were synthesised and evaluated in vitro against acetylcholinesterase by the classical Ellman's test.