Synthesis of 5-alkynyl-2,2,6-trimethyl-1,3-dioxin-4-ones and 1,4-disubstituted-1,2,3-triazoles
作者:Hélio A. Stefani、Adriano S. Vieira、Mônica F.Z.J. Amaral、Leora Cooper
DOI:10.1016/j.tetlet.2011.04.072
日期:2011.8
5-alkynyl-1,3-dioxin-4-ones using Suzuki–Miyaura cross-coupling reaction of potassium alkynyltrifluoroborate salts with 2,2,6-trimethyl-5-iodo-1,3-dioxin-4-one. The resulting 5-ethynyltrimethylsilyl-1,3-dioxin-4-ones obtained through the Sonogashira reaction were further reacted in a Cu(I)-catalyzedHuisgenazide–alkyne1,3-dipolarcycloaddition to form functionalized 1,4-disubstituted-1,2,3-triazoles in
Lewis acid promoted Mannich type reactions of α,α-dichloro aldimines with potassium organotrifluoroborates
作者:Sara Stas、Kourosch Abbaspour Tehrani
DOI:10.1016/j.tet.2007.06.003
日期:2007.9
Potassium phenylethynyltrifluoroborate and potassium styryltrifluoroborates react with α,α-dichlorinated aldimines in the presence of BF3·OEt2 as a Lewis acid to give a new stable class of functionalized propargylamines and allylamines. The use of hexafluoroisopropanol as a co-solvent in this modified Petasis reaction allows high yield isolation of the target compounds.
Copper-Catalyzed Alkynylation of Amides with Potassium Alkynyltrifluoroborates: A Room-Temperature, Base-Free Synthesis of Ynamides
作者:Kévin Jouvin、François Couty、Gwilherm Evano
DOI:10.1021/ol101322k
日期:2010.7.16
An efficient copper-mediated method for the coupling of potassium alkynyltrifluoroborates with nitrogen nucleophiles is reported. This reaction provides the first base-free and room-temperature synthesis of ynamides and allows for an easy preparation of these useful building blocks.
Potassium alkynyltrifluoroborates and potassium (2-phenyl)vinyltrifluoroborates react with N-3-butenyl-(2,2-dichloro-1-propylidene)amine in the presence of BF3 center dot Et2O as a Lewis acid to synthesize rearranged Mannich products. The reaction starts with a cationic 2-aza-Cope rearrangement of the imine, followed by the Lewis acid promoted borono-Mannich-type reaction on the rearranged imine to result in a new class of functionalized N-homoallylamines. (c) 2008 Elsevier Ltd. All rights reserved.
Synthesis of 1,3-enynes via Suzuki-type reaction of vinylic tellurides and potassium alkynyltrifluoroborate salts
作者:Hélio A. Stefani、Rodrigo Cella、Felipe A. Dörr、Claudio M.P. Pereira、Gilson Zeni、Marlito Gomes
DOI:10.1016/j.tetlet.2004.11.160
日期:2005.1
The palladium-catalyzed cross-coupling reaction between potassium alkynyltrifluoroborate salts and vinylic tellurides proceeds readily to afford 1,3-enynes with moderate to good yields. (C) 2004 Elsevier Ltd. All rights reserved.