Visible Light-Induced Cascade Cyclization of 3-Aminoindazoles, Ynals, and Chalcogens: Access to Chalcogen-Containing Pyrimido[1,2-<i>b</i>]-indazoles
Jinlei Zhou, Wen Li, Huitao Zheng, Yongyan Pei, Xiang Liu, Hua Cao
Abstract
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.
Topics & Concepts
ChalcogenChemistrySelenideTelluriumCascadeSeleniumThio-StereochemistryCrystallographyOrganic chemistryChromatographySulfur-Based Synthesis TechniquesOrganoselenium and organotellurium chemistryRadical Photochemical Reactions