Formation of benzo[c]thiophen-1-aminium iodide by the reaction of o-alkynylbenzothioamide with iodine
摘要:
Reaction of o-alkynylbenzothioamide with molecular iodine was investigated. Unique benzo[c]thiophen-1-aminium iodide was obtained when the tertiary thioamide was used as a reactant. The reaction proceeded efficiently in less polar solvent, whereas the corresponding product was also obtained in a polar solvent. Single crystal X-ray analysis revealed that the benzo[c]thiophen-1-aminium structure possesses a resonance structure in N-C-S bond. Its stabilization shows a clear difference in the result from the reaction of amide analogue with iodine to give no stable compound. (C) 2014 Elsevier Ltd. All rights reserved.
Radical-Induced Metal and Solvent-Free Cross-Coupling Using TBAI–TBHP: Oxidative Amidation of Aldehydes and Alcohols with <i>N</i>-Chloramines via C–H Activation
作者:Tapas Kumar Achar、Prasenjit Mal
DOI:10.1021/jo502464n
日期:2015.1.2
A solvent-free cross-coupling method for oxidative amidation of aldehydes and alcohols via a metal-free radial pathway has been demonstrated. The proposed methodology uses the TBAI-TBHP combination which efficiently induces metal-free C–H activation of aldehydes under neat conditions at 50 °C or ball-milling conditions at room temperature.
Electrochemical oxidative 5-exo-dig-oxo-halocyclization of o-alkynylbenzamides was achieved using readily available NaX (X = Cl, Br and I) salts under mild reactionconditions. The use of a cheap and highly stable sodiumhalide as a halide ion source is impressive for the synthesis of a variety of halogenated isobenzofuran-1-imines. This electrochemical protocol shows regioselectivity and excellent