Regioselective Gold-Catalyzed Hydration of CF3- and SF5-alkynes
摘要:
The regioselective gold-catalyzed hydration of CF3- and SF5-alkynes is described. The corresponding trifluoromethylated and pentasulfanylated ketones are obtained in up to 91% yield as single regioisomers showcasing the use of CF3 and SF5 as highly efficient directing groups in this reaction. Notably, this transformation represents the first use of CF3- and SF5-alkynes in gold catalysis.
Fluoroform-Derived CuCF<sub>3</sub> for Trifluoromethylation of Terminal and TMS-Protected Alkynes
作者:Lisi He、Gavin Chit Tsui
DOI:10.1021/acs.orglett.6b00999
日期:2016.6.17
An efficient trifluoromethylation reaction of alkynes using a fluoroform-derived CuCF3 reagent is described. The CF3 source is the inexpensive industrial waste fluoroform (CF3H). The air-stable CuCF3 reagent can be prepared in large quantities and is convenient to use. Synthetically useful trifluoromethylated alkynes containing a wide range of functional groups were successfully synthesized under mild conditions. Both terminal and TMS-protected alkynes gave the products in one step. The beneficial effect of a diamine ligand tetramethylethylenediamine (TMEDA) with the fluoroform-derived CuCF3 reagent was also demonstrated.
Regioselective Gold-Catalyzed Hydration of CF<sub>3</sub>- and SF<sub>5</sub>-alkynes
The regioselective gold-catalyzed hydration of CF3- and SF5-alkynes is described. The corresponding trifluoromethylated and pentasulfanylated ketones are obtained in up to 91% yield as single regioisomers showcasing the use of CF3 and SF5 as highly efficient directing groups in this reaction. Notably, this transformation represents the first use of CF3- and SF5-alkynes in gold catalysis.
Cox, Robin A.; Grant, Ewart; Whitaker, Todd, Canadian Journal of Chemistry, 1990, vol. 68, # 10, p. 1876 - 1881
作者:Cox, Robin A.、Grant, Ewart、Whitaker, Todd、Tidwell, Thomas T.