Synthesis of Some New Biheterocycles by a One-Pot Suzuki-Miyaura Coupling Reaction
摘要:
Halogenated indoles, benzofurans and flavones were subjected to a one-pot Suzuki-Miyaura coupling reaction to generate a series of new biheterocycles. The methodology may be readily adapted to the synthesis of a wide variety of substituted biheterocycles.
Modified Vilsmeier reactions of activated benzofurans with indolines: Synthesis of benzofuran-fused benzocarbazoles
作者:David St.C. Black、Robert Rezaie
DOI:10.1016/s0040-4039(99)00699-1
日期:1999.5
Regioselective reactions of 3-substituted 4,6-dimethoxybenzofurans with indolin-2-ones and triflic anhydride afforded 7- and/or 2-substituted indolo-benzofurans and the latter were cyclised to previously unknown benzofuran-fused benzocarbazoles using palladium (II) acetate in heated acetic acid.
Oxygenated 4-arylisoflavans and 4-heteroarylisoflavans were synthesized in good yields via BF3 center dot OEt2 catalyzed arylation reactions of 4',7-diacetoxyisoflavan-4-ol 8 with activated aryl and heteroaryl compounds. These reactions were found to produce stereoselectively the trans isomers. Similar reactions of 4',7-diacetoxyflavan-4-ol 16 afforded the corresponding 4-arylflavans and 4-heteroarylflavans as mixtures of cis/trans isomers. (C) 2012 Elsevier Ltd. All rights reserved.