1. Henan Province Key Laboratory of New Optoelectronic Functional Materials Henan Provincial Engineering and Technology Research Center for Precise Synthesis of Fluorine-Containing Drugs College of Chemistry and Chemical Engineering Anyang Normal University Anyang 455000 People's Republic of China
2. State Key Laboratory of Fluorine & Nitrogen Chemicals Modern Chemistry Research Institute of Xi'an Xi'an 710065 People's Republic of China