The gold-catalysed direct couplings of indoles 1 and pyrroles 5 with 1,3-dicarbonyls 2 is described. This new method for CC bond formation allows high functional group tolerance, regioselectivity, and scope under relatively mild conditions. Moreover, the 3-alkenylindoles 3 can be readily available through gold-catalysed sequential cyclization/alkenylation reaction of 2-alkynylanilines derivatives 4
Indole 3-alkylation/vinylation under catalysis of the guanidinium ionic liquids
作者:Kurosh Rad-Moghadam、Masoumeh Sharifi-Kiasaraie
DOI:10.1016/j.tet.2009.08.073
日期:2009.10
Two ionic liquids, N,N,N,N-tetramethylguanidinium trifluoroacetate (TMGT) and the unprecedented N,N,N,N-tetramethylguanidinium triflate (TMCTf), were used as catalyst solvents in condensations between indoles and arylaldehydes or 1,3-diketones providing a simple and efficient method for synthesis of bis(3-indolyl)methanes or casually 3-alkenylindoles due to stereoelectronic concerns of reactants. The ionic liquids are easily separated and reused for several times. (c) 2009 Elsevier Ltd. All rights reserved.
Communications - Synthesis of 3-Vinylindoles
作者:Wayland Noland、Donald Robinson
DOI:10.1021/jo01360a031
日期:1957.9
FeCl3-catalyzed alkylation of indoles with 1,3-dicarbonyl compounds: an expedient synthesis of 3-substituted indoles
作者:J.S. Yadav、B.V. Subba Reddy、K. Praneeth
DOI:10.1016/j.tetlet.2007.09.166
日期:2008.1
Indoles undergo smooth alkylation at the 3-position with 1,3-dicarbonyl compounds in the presence of 20 mol % of FeCl3 under mild reaction conditions to produce a wide range of 3-substituted indoles in excellent yields and with high E-selectivity. (c) 2007 Elsevier Ltd. All rights reserved.