Facile Ionic Liquid–Mediated Protocol for the Regioselective Synthesis of 1,5-Benzothiazepines
作者:Renuka Jain、Tripti Yadav、Manoj Kumar、Ashok K. Yadav
DOI:10.1080/00397911.2010.493626
日期:2011.7.1
[image omitted] An efficient one-step ionic liquid-mediated green protocol for the regioselective synthesis of (+)/(+/-)-cis-2-(4-methoxy/benzyloxyphenyl)-3-hydroxy-2,3-dihydro-1,5-benzothiazepin-4-[5H]-ones has been developed from the reaction between substituted 2-aminobenzenethiol and methyl-(+/-)-trans-3-(4-methoxy/benzyloxy phenyl)glycidate, under nitrogen atmosphere, at 60 +/- 2 degrees C. The reaction has been performed in ionic liquids (viz, 1-butyl-3-methylimidazolium bromide/hexafluorophosphate), and the yields of the 1,5-benzothiazepine derivatives were found to be excellent. The cis-stereoisomer was obtained as the major product along with a trans-isomer as minor product.