Direct C–H cross-coupling approach to heteroaryl coumarins
作者:Minsik Min、Bomi Kim、Sungwoo Hong
DOI:10.1039/c2ob07137a
日期:——
A Pd-catalyzed direct cross-coupling of 3-bromocoumarins with heteroarenes provided an efficient route to synthesizing 3-heteroarylcoumarins. The reaction scope for the transformation was fairly broad, affording modest to good yields of various 3-heteroarylcoumarin scaffolds, which are privileged structures and prevalent motifs in many biologically active compounds and fluorophores.
Preparation and Characterization of Substituted 3-Benzothiazol-2-Ylcoumarins
作者:Richard Y. Chao、Mei-Fang Ding、Jhao-Yu Chen、Chuan-Chen Lee、Shaw-Tao Lin
DOI:10.1002/jccs.201000033
日期:2010.4
AbstractA series of substituted 3‐benzothiazolylcoumarins was prepared from condensation of 2‐hydroxy‐benzaldehyde and 2‐cyanomethylbenzothiazole to investigate the effect of the nature and position of substituents on their absorption and fluorescent behavior. Compounds with a substituent containing a heteroatom which attached at the C6 position showed a split broad absorption band. Solutions of these compounds in various solvents exhibited brilliant blue fluorescence. The emission intensity for compounds with an alkoxy group at the C6 or C7 position in DMF was approximately 7‐ and 15‐fold higher than for the corresponding precursor and quinine sulfate solution, respectively. These compounds also exhibit high thermal stability in solid state.