An Alumino-Mannich Reaction of Organoaluminum Reagents, Silylated Amines, and Aldehydes
作者:Anika Tarasewicz、Deeba Ensan、Robert A. Batey
DOI:10.1002/chem.201801012
日期:2018.4.20
A multi‐component coupling using organoaluminum reagents, silylated amines, and aldehydes results in the formation of tertiary amines. Both alkenyl‐ and alkylaluminum reagents undergo reaction with iminium ion substrates for which the corresponding Petasis borono‐Mannichreactions are unsuccessful.
Silicon Reagent with Functionalized Tetrafluoroethylene Fragments: Preparation and Coupling with Aldehydes
作者:Oleg V. Fedorov、Marina I. Struchkova、Alexander D. Dilman
DOI:10.1021/acs.joc.6b01739
日期:2016.10.7
A new fluorinated silicon reagent bearing a functionalized tetrafluoroethylene fragment was prepared from two CF2 building blocks: ethyl bromodifluoroacetate and (bromodifluoromethyl)trimethylsilane. The key C–C bond-forming step involves a difluorocarbene addition/cyclopropane rearrangement sequence. The silicon reagent was coupled with aldehydes and reactive azomethines in the presence of potassium
Pentafluoropropen-2-ol (PFP) was prepared by the reaction of hexafluoroacetone (HFA) with Mg/TMSCl. The one-pot tandem sequential reactions of PFP via Mannich addition with aldimines followed by Friedel-Crafts cyclization and aromatization afforded the title quinolines. A variety of corresponding 3-substituted quinolines were derived from the title quinoline by nucleophilic substitution of 3-fluorine with nucleophiles. A defluorinative transformation of the 4-trifluoromethyl group of the title quinoline with hydrazine afforded pyrazoloquinoline.
Nucleophilic trifluoromethylation with organoboron reagents
作者:Vitalij V. Levin、Alexander D. Dilman、Pavel A. Belyakov、Marina I. Struchkova、Vladimir A. Tartakovsky
DOI:10.1016/j.tetlet.2010.11.025
日期:2011.1
Potassium trialkoxy(trifluoromethyl)borates are shown to behave as convenient reagents for nucleophilic trifluoromethylation of non-enolizable aldehydes and N-tosylimines to give CF3-substituted alcohols and N-tosylamines in good yields. (C) 2010 Elsevier Ltd. All rights reserved.