Die Desulfonierung–Fluorierung von Thiuramdisulfiden, [R2NC(S)S]2 und Silberdithiocarbamaten, Ag[SC(S)NR2] (R = CH3, CH3CH2, C6H5CH2), mit Silber(I)fluorid, AgF — ein einfacher Zugang zu Diorgano(trifluormethyl)aminen, R2NCF3, und Thiocarbamoylfluoriden, R2NC(S)F
摘要:
AgF and [R2NC(S)S](2) (R = CH3, CH3CH2, C6H5CH2), selectively react at room temperature in the stoichiometric ratio of 1:1 to give the corresponding N,N-diorganothiocarbamoyl fluorides, R2NC(S)F, AgSC(S)NR2 and elemental sulfur. Under comparable conditions in a ratio >3:1 both reactants selectively yield diorgano(trifluoromethyl)amines, R2NCF3, AgSC(S)NR2, Ag2S and elemental sulfur. At stoichiometry 6.1, R2NCF3, Ag2S besides elemental sulfur are formed. By analogy, thiocarbarnoyl fluorides and silver dithiocarbamates react with AEF yielding selectively the corresponding trifluoromethylamines. (C) 2001 Elsevier Science B.V. All rights reserved.
Reported herein is the one‐pot synthesis of trifluoromethylated amines at room temperature using the bench‐stable (Me4N)SCF3 reagent and AgF. The method is rapid, operationally simple and highly selective. It proceeds via a formal umpolung reaction of the SCF3 with the amine, giving quantitative formation of thiocarbamoyl fluoride intermediates within minutes that can readily be transformed to N‐CF3