The intermolecular reaction of phenols with propiolicesters in TFA in the presence of a Pd(OAc)2 catalyst, affording coumarin derivatives, is described. An exclusive formation of 5,6,7-trimethoxy-...
Reaction of alkoxyphenols and alkynoates in the presence of a catalytic amount of Pd(OAc)2 in trifluoroacetic acid at room temperature gave coumarin derivatives in high yields. This procedure provides a convenient method for direct synthesis of coumarin derivatives under very mild conditions.
A Single‐Step Assembly of Coumarin Ring Skeleton from Oxygenated Phenols and Acetylenic Esters by Catalytic Indium Chloride in the Absence of Solvent
作者:N. Kalyanam、A. Nagarajan、M. Majeed
DOI:10.1081/scc-120034175
日期:2004.12.31
Abstract Ring oxygenated coumarins were obtained in a single‐step by condensation of appropriately substituted phenols with acetylenicesters by catalytic amounts of indium chloride in the absence of solvent.
摘要 在没有溶剂的情况下,通过适当取代的苯酚与炔酯与催化量的氯化铟缩合,一步得到环氧化香豆素。
Synthesis of coumarins by Pt-catalyzed hydroarylation of propiolic acids with phenols
作者:Juzo Oyamada、Tsugio Kitamura
DOI:10.1016/j.tet.2006.04.080
日期:2006.7
Synthesis of coumarins from phenols and propiolicacids was examined by using a Pt catalyst such as PtCl2/AgOTf, K2PtCl4/AgOTf, and K2PtCl4/AgOAc. Propiolicacid reacted even with less reactive phenols in trifluoroacetic acid to give coumarins and dihydrocoumarins. In the case of substitutedpropiolicacids, phenylpropiolic acid and 2-octynoic acid, the reactions proceeded selectively to afford coumarins
A direct route to coumarin derivatives from phenols and propiolic acids has been developed. Phenols react with propiolic acids in the presence of Pd(OAc) 2 as a catalyst to give coumarins in good yields. The simple process occurs under mild conditions without any additives.