A catalytic amount of copper(II) trifluoromethanesulfonate (Cu(OTf)(2)) in the presence of trimethylchlorosilane (TMSCl) effectively promoted the aminomethylation of indoles bearing a variety of functional groups kith a N-sifyl-N,O-acetal in good to excellent Yields. (C) 2002 Elsevier Science Ltd. All rights reserved.
A New Methodology for Functionalization at the 3-Position of Indoles by a Combination of Boron Lewis Acid with Nitriles
We discovered that a reagent comprising a combination of PhBCl2 and nitriles was useful for syntheses of both 3-acylindoles and 1-(1H-indol-3-yl)alkylamine from indoles. The reaction proceeded selectively at the 3-position of indoles providing 3-acylindoles in moderate to high yields on treatment with the above reagent. Furthermore, the reaction provided the corresponding amine products in moderate
The Aminomethylation of Electron-Rich Aromatics with an <i>N</i>-Silyl-<i>N</i>,<i>O</i>-Acetal Catalyzed by a Metal Triflate-TMSCl System: Facile Synthesis of Aromatic Primary Amines, 1-Aryl-trichloroethylamines
The copper(II) triflate- and hafnium(IV) triflate-catalyzed aminomethylation of indole (2) with an N-silyl-N,O-acetal 1 containing a trichloromethyl group provides the primary amine derivative (3a) in modest yield. When 1 equiv of trimethylchlorosilane (TMSCl) was added to the reaction mixture, the reaction proceeded smoothly, and the yield of 3a was dramatically improved (>90%). The use of this catalytic