Copper-Catalyzed Regioselective Cross-Dehydrogenative Coupling of Coumarins with Benzylic C<sub>sp3</sub>-H Bonds
作者:Shi-Liu Zhou、Li-Na Guo、Xin-Hua Duan
DOI:10.1002/ejoc.201403068
日期:2014.12
A new copper-catalyzed regioselective cross-dehydrogenativecoupling of coumarins with benzylic Csp3–H bonds has been developed. This reaction provides direct access to a wide range of 3-benzylcoumarins in moderate to good yields. The protocol was also extended successfully to other heterocyclic compounds, such as quinolinones.
Iron-catalyzed regioselective alkylation of 1,4-quinones and coumarins with functionalized alkyl bromides
作者:Dengke Li、Xianfu Shen
DOI:10.1039/c9ob02289a
日期:——
A simple and efficient Fe-catalyzed regioselectivealkylation of 1,4-quinones and coumarins, using functionalized alkyl bromides as alkylating reagents, has been developed. The reaction proceeds under mild conditions with the addition of alkyl bromides to a wide range of 1,4-quinone and coumarin derivatives with a broad substrate scope and wide functional group tolerance to provide the products in
limited number of substrates, and harsh reaction condition. Palladiumcatalyzed cross coupling reactions have emerged as a powerful method for the carbon-carbon bond formation. Among them, Suzuki coupling is the most widely used method, because organoboronic acids are generally non-toxic and thermally, air-, and moisture-stable. The palladiumcatalyzed benzyl halides and allyl halide coupling with organoboronic