Magnesium Perchlorate as a New and Highly Efficient Catalyst for the Synthesis of 2,3-Dihydro-1,5-benzothiazepines
作者:Asit Chakraborti、Gopal Khatik、Raj Kumar
DOI:10.1055/s-2007-965892
日期:2007.2
Commercially available magnesium perchlorate has been found to be a highly efficient catalyst for the reaction of 1,3-diarylprop-2-enones with 2-aminothiophenol leading to the synthesis of 2,3-dihydro-1,5-benzothiazepines in high yields and in short times.
Synthesis of 1,5-benzothiazepines with Microwave Irradiation under Solvent and Catalyst-free Conditions
作者:M. Rahman、A. Roy、A. Majee、A. Hajra
DOI:10.3184/030823409x416965
日期:2009.3
Microwave irradiation of α,β-p-unsaturated ketones (chalcones) and o-aminothiophenol in the absence of solvent and catalyst provides a highly efficient methodology for the synthesis of 1,5-benzothiazepines in moderate to good yields.
Facile Synthesis of 1,5-Benzothiazepines in Water Using Tetrabutylammonium Tribromide
作者:Yunhui Yan、Xiaojuan Yang、Liqiang Wu
DOI:10.1080/10426507.2011.627900
日期:2012.5
environmentally benign, and efficient method was developed for the preparation of 1,5-benzothiazepines via a one-pot condensation reaction of 2-aminothiophenol with 1,3-diaryl- 2-propenones using tetrabutylammonium tribromide as an efficient and versatile catalyst in water. GRAPHICAL ABSTRACT
Condensation reactions of o-phenylenediamine and two equivalents of acetophenone under gallium(III) triflate catalysis produce biaryl-substituted 1,5-benzodiazepines. Similar reactions of o-phenylenediamine or o-aminothiophenol and o-hydroxy chalcones lead to formation of functionalized 1,5-benzodiazepines and 1,5-benzothiazepines in good to excellent yields. The ortho-hydoxy group of chalcones is crucial for this unprecedented condensation process. (C) 2008 Elsevier Ltd. All rights reserved.