Access to Biaryl Sulfonamides by Palladium-Catalyzed Intramolecular Oxidative Coupling and Subsequent Nucleophilic Ring Opening of Heterobiaryl Sultams with Amines
作者:Joydev K. Laha、Neetu Dayal、Krupal P. Jethava、Dilip V. Prajapati
DOI:10.1021/acs.orglett.5b00290
日期:2015.3.6
The installation of sulfonamide pharmacophores on heterobiaryls has successfully been executed by a previously unknown palladium-catalyzedintramolecularoxidative coupling in N-arylsulfonyl heterocycles followed by novel ring opening of heterobiaryl sultams with amine nucleophiles. The protocol has a wide scope of substrates warranting broad applications in the synthesis of heterobiaryls containing
The regio- and stereo-selectivities in the [2 + 2] photocycloaddition of a series of 1-benzoylindoles with vinyl acetate and methyl acrylate have been investigated. With some exceptions, the 1 -benzoylindoles gave exclusively or predominantly the corresponding 1-acetoxy-3-benzoyl and 3-benzoyl-1-methoxycarbonyl-1,2,2a,7b-tetrahydro-3H-cyclobut[b]indoles as mixtures of stereoisomers.
研究了一系列的1-苯甲酰基吲哚与乙酸乙烯酯和丙烯酸甲酯的[2 + 2]光环加成反应中的区域和立体选择性。除某些例外,1-苯甲酰基吲哚仅或主要以混合物形式提供相应的1-乙酰氧基-3-苯甲酰基和3-苯甲酰基-1-甲氧基羰基-1,2,2a,7b-四氢-3 H-环丁[ b ]吲哚立体异构体。
Formation of indole nucleus via intramolecular cyclization of aminophenylpropenyltriphenylphosphonium salts with one-carbon degradation
作者:Shin'ichi Taira、Hiroshi Danjo、Tsuneo Imamoto
DOI:10.1016/s0040-4039(02)02199-8
日期:2002.12
Treatment of 3-(2-aminophenyl)-2-propenyltriphenylphosphonium bromide with acid anhydride and tertiary amine affords 1,3-diacylindoles in yields ranging from 22 to 64%. A plausible mechanism of this new cyclization reaction is described.
Using lithium cyanide a simple method for the transformation of 3-acetylindole into the N-alkyl, N-acyl, and N-p-toluenesulfonyl derivatives in good yield is reported. 3-Indolecarbaldehyde is also N-alkylated by the same procedure.