A New and Efficient Method for the Trifluoromethylation of Carbonyl Compounds with Trifluoromethyltrimethylsilane in DMSO
作者:Takeshi Oriyama、Katsuyuki Iwanami
DOI:10.1055/s-2005-922767
日期:——
In the presence of MS 4 A in DMSO, trifluoromethylation of various aldehydes and ketones with trifluoromethyltrimethylsilane (TMSCF 3 ) proceeded very smoothly to give the corresponding trifluoromethylated adduct in goodto quantitative yields without a base catalyst.
在 DMSO 中存在 MS 4 A 的情况下,各种醛和酮与三氟甲基三甲基硅烷 (TMSCF 3 ) 的三氟甲基化非常顺利地进行,以良好的定量产率得到相应的三氟甲基化加合物,无需碱催化剂。
Lewis acid-catalyzed tri- and difluoromethylation reactions of aldehydes
The first Lewis acid-catalyzed trifluoromethylation reactions of aldehydes with Me3SiCF3 under TiF4/DMF, Ti(OiPr)4/DMF and Cu(OAc)2/dppp/toluene conditions are described. We have successfully applied this methodology to the difluoromethylation of aldehydes using Me3SiCF2SePh, Me3SiCF2P(O)OEt2 and Me3SiCF2SPh.
Ammonium bromides/KF catalyzed trifluoromethylation of carbonyl compounds with (trifluoromethyl)trimethylsilane and its application in the enantioselective trifluoromethylation reaction
has been performed by treatment of Me3SiCF3 under initiation by TBAF, TBAT, TMAF as well as CsF. However, these commercially available fluorides are rather expensive and moisture sensitive. Potassiumfluoride (KF) is an inexpensive and commonly used fluoridesource and can be also used as an initiator for the trifluoromethylation, but the method suffers from the significant limitation that only DMF
TBD-Catalyzed Trifluoromethylation of Carbonyl Compounds with (Trifluoromethyl)trimethylsilane
作者:S. Matsukawa、S. Takahashi、H. Takahashi
DOI:10.1080/00397911.2011.644381
日期:2013.6.3
Abstract Trifluoromethylation of carbonylcompounds using (trifluoromethyl) trimethylsilane catalyzed by 1,5,7-triazabicyclo[4,4,0]dec-5-ene (TBD) afforded the corresponding α-trifluoromethyl alcohols in good to excellent yields under mild reaction conditions. Supplemental materials are available for this article. Go to the publisher's online edition of Synthetic Communications® to view the free supplemental