摘要
A clean,efficient method to synthesize 2-amino-4H-3,1-benzothiazines by ytterbium chloride-catalyzed tandem addition-cyclization reaction of o-aminocinnamate and isothiocyanates under solvent-free conditions is developed.
基金
supported by the National Natural Science Foundation of China(20872106,20972107)
the Priority Academic Program Development of Jiangsu Higher Education Institutions
