InBr<sub>3</sub>-Catalyzed Conjugate Addition of Indoles to <i>p</i>-Quinones: An Efficient Synthesis of 3-Indolylquinones
作者:J. Yadav、B. Reddy、T. Swamy
DOI:10.1055/s-2003-44364
日期:——
Indium(III) bromide catalyzes efficiently the conjugate addition of indoles to p-benzoquinones under mild conditions to afford the corresponding 3-indolylquinones in high yields with high selectivity. 1,4-Naphthoquinones also underwent Michael addition with indoles under similar conditions to give 3-indolylnaphthoquinones.
A chiral phosphoric acid‐catalysed asymmetric dearomative [3+2] cyclisation for accessing enantioenriched benzofuroindolines with two vicinal tetrasubstituted carbon centres from readily available 1,4‐quinone and 2,3‐disubstituted indoles is developed. This protocol distinguishes itself by availability of the starting materials and mild reaction conditions in a stereoselective manner, which provides
Bi(OTf)3-catalyzed conjugate addition of indoles to p-quinones: a facile synthesis of 3-indolyl quinones
作者:J.S. Yadav、B.V.S. Reddy、T. Swamy
DOI:10.1016/j.tetlet.2003.10.041
日期:2003.12
A wide range of indoles undergo conjugate addition to p-benzoquinones in the presence of 2 mol% bismuth triflate under mild conditions to afford the corresponding 3-indolyl quinones in excellent yields with high selectivity. (C) 2003 Elsevier Ltd. All rights reserved.