Reactions of <b><i>o</i></b>-Aminothiophenol and <b><i>o</i></b><b>-</b>Aminophenyl Disulfide with Itaconic Anhydride and (-)-Dimenthyl Itaconate: Access to Enantiomerically Pure 1,5-Benzothiazepines and Benzothiazolyl-2-methylacrylic Acid
作者:Narshinha Argade、Md. Baag、Manoj Sahoo、Vedavati Puranik
DOI:10.1055/s-2006-958977
日期:2007.2
A facile chemo- and regioselective reactions of o-aminothiophenol (o-ATP) with itaconic anhydride is described. 1,5-Benzothiazepinyl-3-acetic acid is obtained in 81% yield via the exclusive Michael type addition of the thiol unit from o-ATP to the carbon-carbon double bond in itaconic anhydride followed by an intramolecular anhydride ring opening with an amine unit. The moderately stereoselective Michael
描述了邻氨基苯硫酚 (o-ATP) 与衣康酸酐的简单化学选择性和区域选择性反应。1,5-Benzothiazepinyl-3-乙酸通过将 o-ATP 的硫醇单元独家迈克尔型加成到衣康酸酐中的碳-碳双键,然后用胺进行分子内酸酐开环,以 81% 的产率获得单元。已经证明了从 o-ATP 到 (-)-衣康酸二薄荷酯的硫醇单元的中等立体选择性迈克尔型加成,以 7:3 的比例获得非对映异构体的混合物,产率为 82%。二羧酸中的还原硫-硫键断裂,2-(2-[2-(3-羧基丁-3-烯基氨基)苯基二硫基]苯基氨基甲酰基}甲基)丙烯酸,在 84 中生成相应的苯并噻唑基-2-甲基丙烯酸还报道了%产率,而不是所需的苯并硫代-偶氮辛。