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.
Synthesis of 4-arylcoumarins via palladium-catalyzed arylation/cyclization of ortho-hydroxylcinnamates with diaryliodonium salts
作者:Yang Yang、Jianwei Han、Xunshen Wu、Shujia Xu、Limin Wang
DOI:10.1016/j.tetlet.2015.04.082
日期:2015.6
ortho-hydroxylcinnamate ester derivatives by using diaryliodonium(III) salts has been developed. With this method, 4-arylcoumarins were easily prepared in good to excellent yields under base-free conditions. Additionally, this protocol provided an efficient alternative for the preparation of related 4-arylated coumarin compounds which are useful in the access to 5-lipoxygenaseinhibitors.
Regioselective palladium-catalyzed direct cross-coupling of coumarins with simple arenes
作者:Minsik Min、Sungwoo Hong
DOI:10.1039/c2cc34551j
日期:——
An efficient method for the C4-regiocontrolled C–H functionalization of coumarins to enable facile oxidative cross-couplings with simple arene components is disclosed.
Abstract Coumaryl triflate can be used for a wide range of substitution reactions, either under Pd-catalyzed conditions or via direct nucleophilic substitutions, and is therefore an ideal substrate for the fluorescence labeling of functionalized compounds, such as amino acids. Coumaryl triflate can be used for a wide range of substitution reactions, either under Pd-catalyzed conditions or via direct
A series of water‐soluble encapsulated copper(I), silver(I) or gold(I) complexes based on NHC‐capped permethylated cyclodextrins (ICyDMe) were developed and used as catalysts in pure water for hydration, lactonization, hydroarylation and cycloisomerizationreactions. ICyDMe ligands gave cavity‐based high regioselectivity in hydroarylations, and high enantioselectivities in gold‐catalyzed cycloisomerizations