Synthesis of 2,2-diaryl-1,1-difluoroethenes via Pd-catalyzed dehydrosulfonylative cross-coupling of α-[difluoro(phenylsulfonyl)methyl]benzyl tosylates with arylboronic acids
作者:Rui Zhang、Chuanfa Ni、Yanchuan Zhao、Jinbo Hu
DOI:10.1016/j.tet.2018.04.054
日期:2018.9
By using PhSO2CF2H as the difluoromethylidene equivalent, a novel method for connecting aromatic aldehydes and arylboronic acids via consecutive reactions was developed to obtain structurally diverse 2,2-diaryl-1,1-difluoroethenes. The key step is the palladium-catalyzed dehydrosulfonylative cross-coupling of tosylates that are prepared from PhSO2CF2H, aromatic aldehydes and tosyl chloride. Mechanistic
Cu(I)-Catalyzed Cross-Coupling of Terminal Alkynes with Trifluoromethyl Ketone <i>N</i>-Tosylhydrazones: Access to 1,1-Difluoro-1,3-enynes
作者:Zhikun Zhang、Qi Zhou、Weizhi Yu、Tianjiao Li、Guojiao Wu、Yan Zhang、Jianbo Wang
DOI:10.1021/acs.orglett.5b00980
日期:2015.5.15
elimination have been achieved in a Cu(I)-catalyzed cross-coupling reaction of terminal alkynes and trifluoromethyl ketone N-tosylhydrazones. The reaction represents an efficient synthesis of 1,1-difluoro-1,3-enyne derivatives. Mechanistically, the migratory insertion of the copper carbene intermediate leads to the C–C bond formation, which is followed by C–F bond cleavage.
Efficient Synthesis of 2,2-Diaryl-1,1-difluoroethenes via Consecutive Cross-Coupling Reactions of 2,2-Difluoro-1-tributylstannylethenyl <i>p</i>-Toluenesulfonate
作者:Seung Yeon Han、In Howa Jeong
DOI:10.1021/ol1024037
日期:2010.12.3
2,2-Difluoro-1-tributylstannylethenyl p-toluenesulfonate (2) was reacted with aryl iodides in the presence of 10 mol % of Pd(PPh3)4 and 10 mol % of CuI in DMF at 80 °C for 10−20 h to give the cross-coupled products 3 in 35−97% yields. Further coupling reaction of 3 with arylstannanes in the presence of 5 mol % of Pd(PPh3)4 and 3 equiv of LiBr in DMF at 100 °C for 2−24 h afforded the desired products
A novel method for the synthesis of 2,2-diaryl-1,1-difluoroethenes
作者:Ji Hoon Choi、In Howa Jeong
DOI:10.1016/j.tetlet.2007.12.028
日期:2008.2
β,β-Difluoro-α-phenylvinylstannane 3 was prepared in 60% yield from the reaction of β,β-difluoro-α-phenylvinylsulfone 2 with tributyltin hydride in refluxing benzene for 5 h. The cross-coupling reaction of 3 with aryl iodides bearing substituents such as proton, fluoro, chloro, bromo, methoxy, methyl, trifluoromethyl, and nitro on ortho, meta, para positions of the benzene ring in the presence of 10 mol %
Rh(I)-Catalyzed Reaction of Trifluoromethylketone <i>N</i>
-Tosylhydrazones and Arylboronates
作者:Zhikun Zhang、Weizhi Yu、Qi Zhou、Tianjiao Li、Yan Zhang、Jianbo Wang
DOI:10.1002/cjoc.201500889
日期:2016.5
Rh(I)‐Catalyzed synthesis of 1,1‐difluoro‐2,2‐diarylalkenes from trifluoromethylketone N‐tosylhydrazones and arylboronates is presented in this communication. This new synthetic method is based on the Rh(I)‐carbene migratory insertion followed by β‐fluorideelimination. In one particular case the protonation occurs instead of β‐fluorideelimination, affording 2,2‐diaryl trifluoroethane product.