Yield of benzothiazine derivatives and catalysis by heteropolyacids

2016-05-30T13:19:36Z (GMT) by Alireza Samzadeh-Kermani

An efficient heteropolyacid-catalyzed reaction for the synthesis of benzothiazine derivatives is reported. In this transformation, H3PW12O40 was employed as a catalyst in a reaction involving 2-aminobenzenethiols, acetylenic esters, and malonate esters. Optimum conditions are developed in i-PrOH at 50˚C for 7 h.