Based on substrate-design concept, a high chemoselectivitive synthetic strategy of novel benzo[e]pyrazolo[1,5-c][1,3]thiazine compounds through the Cu-catalyzed reactions of 5-(2-bromoaryl)-1H-pyrazol-3-amines and isothiocyanates was developed by using 1-(2-bromoaryl)-3-ethoxy-3-amino-prop-2-en-1-ones as raw material, which has advantages of simple operation, mild reaction conditions and high yields.
Received July 14,2014;revised August 25,2014;published online September 9,2014.Project supported by the National Natural Science Foundation of China(Nos.21072110,21372137)and the Natural Science Foundation of Shandong Province(No.ZR2012BM003).过渡金属催化