Cyclic-Protected Hexafluoroacetone as an Air-Stable Liquid Reagent for Trifluoromethylations
An air‐stable liquid trifluoromethylating reagent is readily synthesized from gaseous hexafluoroacetone and 2‐methylproline on a gram scale. The reaction of the trifluoromethylating reagent with tert‐butoxy cuprate K[Cu(OtBu)2] leads to the CuCF3 in high yield. This species is directly formed from t...
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Published in | European journal of organic chemistry Vol. 2016; no. 23; pp. 4099 - 4104 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
WEINHEIM
Blackwell Publishing Ltd
01.08.2016
Wiley Wiley Subscription Services, Inc |
Subjects | |
Online Access | Get full text |
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Summary: | An air‐stable liquid trifluoromethylating reagent is readily synthesized from gaseous hexafluoroacetone and 2‐methylproline on a gram scale. The reaction of the trifluoromethylating reagent with tert‐butoxy cuprate K[Cu(OtBu)2] leads to the CuCF3 in high yield. This species is directly formed from the tetrahedral cuprate intermediate through intramolecular migration of the trifluoromethyl group to copper. The CuCF3 reagent prepared in situ by our method can be used for the trifluoromethylation of aryl iodides, arylboronic acids, and terminal alkynes in good to excellent yields, even on a gram scale. Furthermore, the CuC2F5 reagent can be prepared in the same way, and this can be used in the pentafluoroethylation of arylboronic acids or aryl bromides in good to excellent yields.
An air‐stable liquid trifluoromethylating reagent is readily synthesized from gaseous hexafluoroacetone and 2‐methylproline on a gram scale. The reaction of the trifluoromethylating reagent with tert‐butoxy cuprate K[Cu(OtBu)2] leads to the CuCF3 reagent, which can then be used for the trifluoromethylation of aryl iodides, arylboronic acids, and terminal alkynes in good to excellent yields. |
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Bibliography: | ArticleID:EJOC201600711 istex:CD7A9B97A427FEB0F732282F6BC23138BF55EBE8 ark:/67375/WNG-ZVDKHPWF-T |
ISSN: | 1434-193X 1099-0690 |
DOI: | 10.1002/ejoc.201600711 |