Mild and metal-free trifluoromethylation and pentafluoroethylation of gem-difluoroalkenes with TMSCF3 and TMSCF2CF3
摘要:
A direct and efficient approach for the trifluoromethylation and pentafluoroethylation of 1,1-diary1-2,2-difluoroethenes with TMSCF3 and TMSCF2CF3 in the presence of TBAF was developed. The reactions proceeded smoothly under mild reaction conditions to give the corresponding monotrifluoromethylated, bistrifluoromethylated, monopentafluoroethylated and bispentafluoroethylated products in fair to good yields, respectively, without the addition of metal catalyst. (c) 2015 Elsevier Ltd. All rights reserved.
Preparation of (2,2-difluoroethenylidene)bis(tributylstannane) and arylation reaction: efficient approach to 1,1-diaryl-2,2-difluoroethenes
作者:Seung Yeon Han、Hyo Young Lee、Jong Hee Jeon、In Howa Jeong
DOI:10.1016/j.tetlet.2012.01.127
日期:2012.4
Reaction of 2,2-difluoro-1-tributylstannylethenyl p-toluenesulfonate (1) with bis(tributyltin) in the presence of 5 mol % Pd(PPh3)4 and 30 equiv LiBr in THF at reflux temperature for 7 h afforded (2,2-difluoroethenylidene)bis(tributylstannane) (2) in a 70% yield. Coupling reaction of 2 with aryl iodides in the presence of 5 mol % Pd(PPh3)4 and 5 mol % CuI in DMF at 80 °C for 3–4 h provided the coupled
Base-mediated direct fluoroalkenylation of 2-phenyl-1,3,4-oxadiazole, benzothiazole and benzoxazole with gem-difluoroalkenes
作者:Xuxue Zhang、Yingyin Lin、Juan Zhang、Song Cao
DOI:10.1039/c4ra13761b
日期:——
Direct α-fluorovinylation of 2-phenyl-1,3,4-oxadiazole, benzothiazole and benzoxazole with gem-difluoroalkenes under the assistance of KHMDS or NaH at room temperature was developed.
Synthesis of fluorovinyl pyrazolyl (thio)ethers by the reaction of gem -difluoroalkenes with pyrazolin-5-ones (thiones)
作者:Tao Huang、Xianghu Zhao、Xinfei Ji、Wei Wu、Song Cao
DOI:10.1016/j.jfluchem.2015.12.007
日期:2016.2
A mild and efficient method for the preparation of fluorovinyl pyrazolyl ethers and thioethers by the reaction of gem-difluoroalkenes having aryl substituents with pyrazolin-5-ones and pyrazolin-5-thiones, respectively, in the presence of t-BuOK is described.
Synthesis of fluorovinyl aryl ethers by a three-component reaction of gem-difluoroalkenes with arylboronic acids and oxygen
作者:Mingjin Wang、Fang Liang、Yang Xiong、Song Cao
DOI:10.1039/c4ra16468g
日期:——
A novel and efficient three-component reaction for the synthesis of fluorovinyl aryl ethers from gem-difluoroalkenes, arylboronic acids and oxygen under metal-free conditions is described.