Synthesis of 6-phenylbenzo[h]quinolines via photoinduced dehydrogenative annulation of (E)-2-phenyl-3-styrylpyridines

A efficient method for the synthesis of 6-phenylbenzo[ h ]quinolines 2 has been developed. This strategy has the prominent advantages of simple operation, mild reaction conditions, high atom efficiency, and transition-metal/catalyst-free process.