Silver-Catalyzed Difluoroamidation of Activated Alkenes for the Construction of Difluorinated 3,3-Disubstituted Oxindoles
作者:Chao Wang、Qiao Chen、Quanping Guo、Hong Liu、Zhaoqing Xu、Yubing Liu、Mengran Wang、Rui Wang
DOI:10.1021/acs.joc.6b01013
日期:2016.7.1
catalyzed difunctionalization of activated alkenes through a difluoroamidic radical addition to afford difluoroamidated 3,3-disubstituted oxindoles has been developed. Various functional groups were well tolerated. Moreover, the product could be efficiently derived to the corresponding difluorofunctionalized alcohol, ketone, and ester in high yields. The mechanistic studies revealed that a radical pathway
α,α-Difluoro-α-(trimethylsilyl)acetamides as Versatile Reagents for the Preparation of Difluorinated Aldol and Mannich Adducts
作者:Aurélien Honraedt、Arie Van Der Lee、Jean-Marc Campagne、Eric Leclerc
DOI:10.1002/adsc.201700371
日期:2017.8.17
The very efficient addition of α,α‐difluoro‐α‐(trimethylsilyl)acetamides to aldehydes, ketones and N‐(tert‐butanesulfinyl)imines is described. The reaction is promoted by a catalytic amount of tetra‐n‐butylammonium diphenyltrifluorosilicate (TBAT) and high yields, as well as very high stereoselectivities in the case of N‐(tert‐butanesulfinyl)imines, are achieved. The synthetic potential of this method
Transition-Metal-Free Dehydrosilylative Difluoroamidation of Tetrahydroisoquinolines under Mild Conditions
作者:Qiao Chen、Jiawei Zhou、Yanan Wang、Chao Wang、Xihong Liu、Zhaoqing Xu、Li Lin、Rui Wang
DOI:10.1021/acs.orglett.5b01997
日期:2015.9.4
Disclosed herein is a dehydrosilylative difluoroamidation of alpha-Csp(3)-H of tetrahydroisoquinolines with alpha,alpha-difluoro-alpha-TMS-acetamides. The process, which occurs at ambient temperature in the absence of any transition metals, provides direct access to a broad range of alpha,alpha-difluoroacetamide-substituted tertiary amine derivatives in high yields. Moreover, the method was successfully applied in the Csp(3)-H-directed difluorophosphorylation and difluorocarboxylation under the same conditions.
Copper(0)-mediated fluoroalkylation of iodobenzene with 2-bromo-1,1,2,2-tetrafluoroethyl compounds: Investigation on the influence of R substituent on the reactivity of RCF2Cu species
作者:Jieming Zhu、Chuanfa Ni、Bing Gao、Jinbo Hu
DOI:10.1016/j.jfluchem.2014.08.011
日期:2015.3
We have made a systematic investigation on the copper(0)-mediated tetrafluoroethylenation of iodobenzene with structurally diverse 2-bromo-1,1,2,2-tetrafluoroethyl compounds. A comparison of this reaction with 1,2,2-trifluoro-1-phenylethylation and the known functionalized difluoroalkylation demonstrates that the substituent R of alpha,alpha-difluoroalkyl copper species RCF2Cu plays a crucial role on their reactivity, which is believed to be useful for the development of new fluoroalkylation reactions under the promotion of transition metals. (C) 2014 Elsevier B.V. All rights reserved.
Pd-Catalyzed α-Arylation of Trimethylsilyl Enolates of α,α-Difluoroacetamides
作者:Shaozhong Ge、Sophie I. Arlow、Michael G. Mormino、John F. Hartwig
DOI:10.1021/ja508590k
日期:2014.10.15
ilyl)acetamides with aryl and heteroaryl bromides catalyzed by an air- and moisture-stable palladacyclic complex containing P(t-Bu)2Cy as ligand. A broad range of electronically varied aryl and heteroaryl bromides underwent this transformation to afford α-aryl-α,α-difluoroacetamides in high yields. Due to the electrophilicity of the fluorinated amide, this palladium-catalyzed cross-coupling reaction