Palladium-catalyzed enantioselective allylic alkylation of trifluoromethyl group substituted racemic and acyclic unsymmetrical 1,3-disubstituted allylic esters with malonate anions
We examined the palladium-catalyzedallylic alkylation of trifluoromethyl group-substituted racemic and acyclic unsymmetrical 1,3-disubstituted allylic benzoate with a malonate anion, and succeeded in obtaining an enantiomerically enriched product in high yields with high ee values through the dynamic kinetic asymmetric transformation (DYKAT). The best result was attained by the [Pd(C3H5)(cod)]BF4/(S)-tol-BINAP
我们研究了三氟甲基取代的外消旋和无环不对称1,3-二取代的烯丙基苯甲酸酯与丙二酸阴离子的钯催化的烯丙基烷基化,并通过动态动力学不对称转化成功获得了高收率,高ee值的对映体富集产品。 (DYKAT)。在BSA或DMAP作为碱的情况下,通过[Pd(C 3 H 5)(cod)] BF 4 /(S)-tol-BINAP可获得最佳结果。
Nucleophilic Trifluoromethylation of Imines under Acidic Conditions
作者:Vitalij V. Levin、Alexander D. Dilman、Pavel A. Belyakov、Marina I. Struchkova、Vladimir A. Tartakovsky
DOI:10.1002/ejoc.200800820
日期:2008.11
A general method for the trifluoromethylation of imines by using Me3SiCF3 under acidic conditions is described. The reaction is promoted by hydrofluoric acid generated in situ from KHF2 and either TFA or TfOH. A new chemoselectivity pattern was achieved, as the C=N bond was found to be more reactivate than the carbonyl group. The trifluoromethylation reaction is believed to proceed by concerted transfer
Nucleophilic Trifluoromethylation Using Trifluoromethyl Iodide. A New and Simple Alternative for the Trifluoromethylation of Aldehydes and Ketones
作者:Samia Aït-Mohand、Naoto Takechi、Maurice Médebielle、William R. Dolbier
DOI:10.1021/ol016933x
日期:2001.12.1
A novel method for nucleophilic trifluoromethylation of aldehydes and ketones, based on photoinduced reduction of trifluoromethyl iodide by tetrakis(dimethylamino)ethylene (TDAE), is presented. [reaction: see text]
Ultrasound-promoted selective perfluoroalkylation on the desired position of organic molecules
作者:Tomoya Kitazume、Nobuo Ishikawa
DOI:10.1021/ja00304a026
日期:1985.9
Reaction d'halogenopolyfluoroalcanes et de poudre de zinc avec divers aldehydes, cetones, derives du styrene et du propene. Induction asymetrique avec des enamines optiquement actives en presence de poudre de zinc et CpTiCl 2
反应 d'halogenopolyfluoroalcanes et de poudre de 锌 avec divers 醛,丙酮,衍生苯乙烯和丙烯。感应不对称 avec des enamines optiquement actives en poudre de Zinc et CpTiCl 2
TRIFLUOROMETHYLATION OF CARBONYL COMPOUNDS WITH TRIFLUOROMETHYLZINC IODIDE UNDER ULTRASONIC IRRADIATION
作者:Tomoya Kitazume、Nobuo Ishikawa
DOI:10.1246/cl.1981.1679
日期:1981.12.5
The trifluoromethylation of carbonylcompounds with trifluoromethylzinc iodide, prepared from trifluoromethyl iodide with ultrasonically dispersed zinc, smoothly proceeded to give corresponding α-trifluoromethyl carbinols in good yields.