palladium-catalyzed coupling of aryl triflates with pyrazolederivatives is described. Using tBuBrettPhos as a ligand, the palladium-catalyzed C–N coupling of a variety of aryl triflates including ortho-substituted ones with pyrazolederivatives proceeded efficiently to give N-arylpyrazole products in high yields. 3-Trimethylsilylpyrazole was found to be an excellent pyrazole substrate for the coupling, and the corresponding
Novel Aminomethyl Derivatives of 4‐Methyl‐2‐prenylphenol: Synthesis and Antioxidant Properties
作者:Evgeny V. Buravlev、Irina V. Fedorova、Oksana G. Shevchenko、Aleksandr V. Kutchin
DOI:10.1002/cbdv.201800637
日期:2019.3
synthesized from para‐cresol and prenol, natural alcohol under the conditions of heterogeneous catalysis. A series of nine new aminomethyl derivatives with secondary and tertiary amino groups were obtained on the basis of compound 1. A comparative evaluation of their antioxidantproperties was carried out using in vitro models. It was established that Mannich base with octylaminomethyl group has radical‐scavenging
Comparative evaluation of antioxidant activity of 2-alkyl-4-methylphenols and their 6-n-octylaminomethyl derivatives
作者:E. V. Buravlev、I. V. Fedorova、O. G. Shevchenko
DOI:10.1007/s11172-019-2508-1
日期:2019.5
A series of 2-alkyl-4-methyl-6-n-octylaminomethylphenols (where alkyl is methyl or tert-butyl group, or terpene substituent) was synthesized. A comparative evaluation of the antioxidant properties of the starting alkyl- and terpenylphenols and their Mannich bases was carried out using in vitro assays. Structural features providing high antioxidant activity of these compounds were revealed.
Regiospecific alkenylation of phenols by 1,1-dimethylallene promoted by platinum catalysts
作者:Augusto De Renzi、Achille Panunzi、Antonio Saporito、Aldo Vitagliano
DOI:10.1039/p29830000993
日期:——
1,1-Dimethylallene reacts with phenolic substrates in the presence of catalytic amounts of platinum(II) complexes. A regiospecific C-alkenylation takes place, affording o-isopentenylphenols and 2,2-dimethylchromans. Possible reaction mechanisms are also discussed.
Bismuth(III) Triflate: Novel and Efficient Catalyst for Claisen and Fries Rearrangements of Allyl Ethers and Phenyl Esters
作者:B. Sreedhar、V. Swapna、Ch. Sridhar
DOI:10.1081/scc-120030693
日期:2004.12.31
Abstract Bismuth(III) triflate catalyzed Claisen and Fries rearrangements of allylphenylethers and phenyl acetates have been presented. The reaction proceeds smoothly and yields corresponding rearranged products in good yields. The bismuth triflate displays higher activity over the corresponding La, Yb, and Sc triflates.