AsterriquinoneD was easily synthesized in three steps from 2,5-dichloro-1,4-benzoquinone. The reaction of benzoquinone with indole in the presence of Pd(OAc)2, followed by oxidation with cerium (IV) ammonium nitrate (CAN) produced 3,6-dichloro-2,5-bis (3-indolyl)-1,4-benzoquinone. The methoxylation of the dichloride with NaOH in CH3OH afforded asterriquinoneD.
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.