Construction of Covalent\nOrganic Frameworks via a\nVisible-Light-Activated Photocatalytic Multicomponent Reaction

Abstract

Multicomponent reactions (MCRs), as a powerful one-pot\ncombinatorial\nsynthesis tool, have been recently applied to the synthesis of covalent\norganic frameworks (COFs). Compared with the thermally driven MCRs,\nthe photocatalytic MCR-based COF synthesis has not yet been investigated.\nHerein, we first report the construction of COFs by a photocatalytic\nmulticomponent reaction. Upon visible-light irradiation, a series\nof COFs with excellent crystallinity, stability, and permanent porosity\nare successfully synthesized via photoredox-catalyzed multicomponent\nPetasis reaction under ambient conditions. Additionally, the obtained <b>Cy-N</b>_<b>3</b><b>-COF</b> exhibits excellent\nphotoactivity and recyclability for the visible-light-driven oxidative\nhydroxylation of arylboronic acids. The concept of photocatalytic\nmulticomponent polymerization not only enriches the methodology for\nCOF synthesis but also opens a new avenue for the construction of\nCOFs that might not be possible with the existing synthetic methods\nbased on thermally driven MCRs.