Palladium catalyzed Heck-arylation/cyclization cascade: An environmentally benign and efficient synthesis of 4-arylcoumarins in water
作者:Junmin Chen、Wei Liu、Liandi Zhou、Yongli Zhao
DOI:10.1016/j.tetlet.2018.05.032
日期:2018.6
An environmentally benign and efficient approach for the synthesis of 4-arylcoumarins from ortho-hydroxy cinnamate ester derivatives with aryl iodides was developed in water under aerobic conditions. This transformation proceeds through a palladiumcatalyzed Heck-arylation/cyclization cascade reaction. The present protocol features a wide substrate scope and readily available starting materials to
A Convenient Solid-Phase Synthesis of Coumarins by TMSOTf-Catalyzed Intramolecular Seleno-Arylation of Tethered Alkenes
作者:E. Tang、Wen Li、Zhangyong Gao
DOI:10.1055/s-0031-1290618
日期:2012.4
performed using polystyrene-supported succinimidyl selenide as the selenium source. This catalytic process provides an efficient method for the regioselectivesynthesis of dihydrocoumarins possessing a seleno functionality, followed by syn elimination of selenoxides to provide coumarins in good yields and purities. Suzuki cross-coupling reaction of the resin-bound bromodihydrocoumarin was also performed
An efficient protocol for the direct synthesis of 4-arylcoumarins via palladium-catalyzedoxidativeHeck coupling reaction of coumarins and arylboronicacids was developed. 4-Arylcoumarins were obtained in moderate to excellent yields, and the reaction also showed tolerance toward functional groups such as hydro, methoxy, diethylamino, nitro, and chloro groups.
Palladium-Catalyzed Synthesis of 4-Arylcoumarins Using Triarylbismuth Compounds as Atom-Efficient Multicoupling Organometallic Nucleophiles
作者:Maddali L. N. Rao、Varadhachari Venkatesh、Deepak N. Jadhav
DOI:10.1002/ejoc.201000134
日期:——
Triarylbismuth compounds have been cross-coupled as atom-efficientmulticoupling organometallic nucleophiles with 4-bromo- and 4-(trifluoromethylsulfonyloxy)coumarins underpalladiumcatalysis conditions. These reactions afforded an array of 4-arylcoumarins in high yields. The general palladium protocol has been demonstrated to be efficient for the coupling of both bromide and triflate derivatives
Synthesis of neoflavones by Suzuki arylation of 4-substituted coumarins
作者:Gerard M. Boland、Dervilla M. X. Donnelly、Jean-Pierre Finet、Martin D. Rea
DOI:10.1039/p19960002591
日期:——
Palladium-catalysed coupling of the 4-chloro- or 4-bromo-coumarins 1–4 with arylboronic acids 5–13 under the Suzuki reaction conditions constitutes an efficient access to 4-arylcoumarins. These 4-arylcoumarins can also be obtained in good yields (70–97%) by treatment of 4-trifluoromethyl-sulfonyloxycoumarins 35–38 with arylboronic acids under modified Suzuki reaction conditions, involving the use of copper(I) iodide as a co-catalyst.