Facile deoxygenation of hydroxylated flavonoids by palladium-catalysed reduction of its triflate derivatives
An efficient procedure to deoxygenate hydroxy substituted flavonoids, isoflavonoids and related compounds via their trifluoromethanesulfonates is presented. Their reduction with formic acid in the presence of a catalytic amount of palladium acetate, triethylamine and 1,3-bis(diphenyl-phosphanyl) propane (dppp) in DMF results in their des-hyaroxy derivatives without affecting other functional groups.
K?vér, József,Antus, Sándor
p. 792 - 796
(2007/10/03)
Modification of hydroxybenzopyranoids: Facile deoxygenation of 2,2-dimethyl-7-hydroxy-4-chromanones and a new approach to their novel mercapto analogs
A facile deoxygenation of a systematic series of substituted 2,2-dimethyl-7-hydroxy-4-chromanones via their sulfonate, isourea, and thiocarbamate derivatives is reported. The synthesis of novel 2,2-dimethyl-7-mercapto-4-chromanones has been accomplished b
Sebok,Timar,Eszenyi,Patonay
p. 6318 - 6321
(2007/10/02)
ON THE REACTION OF SUBSTITUTED PHENOLS AND 3-METHYLBUT-2-ENOIC ACID. A COMPARATIVE STUDY
A systematic and comparative study of the reaction of a series of substituted phenols and 3-methylbut-2-enoic acid in zinc chloride/phosphorus oxychloride and aluminum chloride/phosphorus oxychloride reveals that the formation of phenolic esters and 2,2-dimethyl-4-chromanones is strongly influenced by the substituents, their popsition on the aromatic ring of the starting phenols.Based on our study, a mixed Friedel-Crafts and Fries rearrangement mechanism is in operation in these reactions.
Seboek, Peter,Jekoe, Jozsef,Timar, Tibor,Jaszberenyi, Joseph Cs.
p. 2099 - 2114
(2007/10/02)
On the synthesis of substituted 2,2-dimethyl1-4-chromanones and related compounds
A systematic study of the reaction of a series of monosubstituted phenols 3 and 3-methylbut-2-enoic acid 4 in phosphorus oxychloride/zinc chloride revealed that the formation of 4-chromanones was strongly infuenced by the substituents and their position on the aromatic ring of the starting phenols.
Seboek, Peter,Jekoe, Jozsef,Timar, Tibor,Jaszberenyi, Joseph Cs.
p. 2791 - 2794
(2007/10/02)
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