Yield of benzothiazine derivatives and catalysis by heteropolyacids
作者:Alireza Samzadeh-Kermani
DOI:10.1080/17415993.2016.1187733
日期:2016.11.1
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. GRAPHICAL ABSTRACT
CuO nanoparticles provide an efficient, economic, and novel method for the synthesis of quinoxaline, benzoxazine, and benzothiazine under ultrasonic irradiation. The protocol offers advantages in terms of higher yields, short reaction times, and mild reaction conditions, with reusability of the catalyst.
Recyclable CuO nanoparticles provide an efficient, economic, and novel method for the synthesis of quinoxaline, benzoxazine, and benzothiazine. This method provides a wide range of substrate applicability, avoids the use of organic solvents, and gives benzoheterocycles in satisfactory yields.
A rational eco-compatible design strategy for regio- and diastereoselective synthesis of novel dispiropyrrolidine/thiapyrrolizidine hybrids
作者:Anshu Dandia、Ruby Singh、Shahnawaz Khan、Sukhbeer Kumari、Pragya Soni
DOI:10.1016/j.tetlet.2015.04.130
日期:2015.7
A facile regio- and stereoselectivesynthesis of novel dispiroheterocyclic hybrids containing benzo[1,4]oxazine/benzo[1,4]thiazine and pyrrolidine/thiapyrrolizidine moieties via 1,3-dipolar cycloaddition reaction was carried out. The reaction has been carried out using 2,2,2-trifluoroethanol as a new alternative green solvent and catalyst for rapid access to construct a diversity-oriented library of