The palladium-catalyzedannulation reaction of a variety of fluorine-containing internalalkynes with 2-iodoaniline derivatives took place smoothly to give the corresponding 2,3-disubstituted indol...
钯催化的各种含氟内炔与2-碘苯胺衍生物的环化反应顺利进行,得到相应的2,3-二取代吲哚...
A Facile Regiocontrol in the Palladium-Catalyzed Annulation of Fluorine-Containing Internal Alkynes with Variously Substituted 2-Iodoanilines: A New Regioselective Synthesis of 2- or 3-Fluoroalkylated Indole Derivatives
Treatment of various types of fluoroalkylated alkynes with o-iodoaniline in the presence of Pd(PPh3)4 in DMF at 80 °C for 8 h mainly gave 2-fluoroalkylated indoles in high yields. The use of P(o-Tol)3 instead of PPh3 as a ligand led to the preferential formation of 3-fluoroalkylated indoles in high yields. Interestingly, the reaction of trifluoromethylated alkynes bearing a benzylic substituent afforded
α-Trifluoromethyl-β-aryl enamines in the synthesis of trifluoromethylated heterocycles by the Fischer and the Pictet–Spengler reactions
作者:Vasiliy M. Muzalevskiy、Valentine G. Nenajdenko、Aleksey V. Shastin、Elizabeth S. Balenkova、Günter Haufe
DOI:10.1016/j.tet.2009.06.120
日期:2009.9
α-Trifluoromethyl-β-aryl enamines were successfully used as synthetic equivalents of benzyltrifluoromethyl ketones in both the Fischer indole synthesis and the Pictet–Spengler reaction. Accordingly, 2-trifluoromethyl indoles and a variety of trifluoromethylated 4,5,6,7-terahydro-1H-pyridines including carbolines were synthesized in moderate to good yields.