supported by the National Natural Science Foundation of China (Nos.21772142,21901181 and 21961142015);the National Key Research and Development Program of China (No.2019YFA0905100);Tianjin Municipal Science & Technology Commission (No.19JCQNJC04700);the CNRS in France。
Three bench-stable difluoromethylene phosphonate hydrazones were prepared from simple diethyl(difluoromethyl)phosphonate within two steps in good yields. The [3 + 2] cycloaddition reaction of these diazo precursors wi...