Visible Light-Induced Cascade Cyclization Of 3-Aminoindazoles, Ynals, And Chalcogens: Access To Chalcogen-Containing Pyrimido[1,2-B]-Indazoles

A direct cascade cyclization of 3-aminoindazoles, ynals, and accessible chalcogens facilitated by visible light has been developed. A series of fluoroactive selenium/tellurium-substituted pyrimido[1,2-b]-indazoles were easily accessed in moderate to good yields with a broad scope. Furthermore, we surveyed the spectral properties of selenide pyrimido[1,2-b]-indazoles prepared by this method.