Domino Hydroboration/Trifluoromethylation of Alkynes Using Fluoroform-Derived [CuCF3]
摘要:
A domino hydroboration/trifluoromethylation (formal hydrotrifluoromethylation) of alkynes using the fluoroform-derived [CuCF3] reagent is achieved. Synthetically useful (E)-alkenyl-CF3 building blocks and 1,1-bis(trifluoromethyl)-substituted alkenes can be prepared under ambient conditions in one pot/one step from alkynes. The ultimate source of CF3 is the inexpensive industrial waste fluoroform.
Copper(I)-Catalyzed Interrupted Click Reaction with TMSCF<sub>3</sub>: Synthesis of 5-Trifluoromethyl 1,2,3-Triazoles
作者:Kelvin Pak Shing Cheung、Gavin Chit Tsui
DOI:10.1021/acs.orglett.7b01116
日期:2017.6.2
We herein describe a Cu(I)-catalyzed interrupted click reaction, using (trifluoromethyl)trimethylsilane (TMSCF3) as a nucleophilic CF3 source, to synthesize 5-trifluoromethyl 1,2,3-triazoles in one step from readily available terminal alkynes and azides. The reaction shows complete regioselectivity, broad substrate scope, and good functional group tolerability. The application of the reaction has been
An improved method for the efficient copper-mediated trifluoromethylation of terminalalkynes has been developed. This protocol highlights the convenient access to a variety of aryl-substituted trifluoromethylated alkynes by oxidativetrifluoromethylation with two equivalents of TMSCF3 at room temperature.
Direct Synthesis of a Trifluoromethyl Copper Reagent from Trifluoromethyl Ketones: Application to Trifluoromethylation
作者:Hiroki Serizawa、Kohsuke Aikawa、Koichi Mikami
DOI:10.1002/chem.201303828
日期:2013.12.23
fluorine: The direct synthesis of CuCF3 from a cuprate reagent and trifluoromethyl ketones, as one of the most economical and efficient trifluoromethyl sources, was accomplished. The advantages of this method are all of reagents employed are low‐cost, operation is simple, and the yield of CuCF3 is virtually quantitative (see scheme). Furthermore, three types of trifluoromethylations smoothly proceeded
A simple and practical strategy for the preparation of 1,2‐dithiole‐3‐thiones via copper‐catalyzed defluorinative thioannulation of trifluoropropynes has been developed using elemental sulfur as the sole sulfur source. This reaction displays a wide substrate scope and high functional group tolerance to afford the corresponding S‐heterocycles in moderate to good yields and features efficient construction
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.