Regiospecific C–N Photocyclization of 2‑Styrylquinolines

Regiospecific C–N photocyclization of 2-styrylquinolines resulting in formation of potentially biologically active quino­[1,2-<i>a</i>]­quinolizinium derivatives was investigated. The presence of strong electron-donating groups in the phenyl ring reveals to be a crucial factor managing photocyclization effectiveness. Introduction of a crown ether moiety allows changing the photoreaction parameters by means of complexation with Mg­(ClO₄)₂