fig5

Figure 5. Co-N/C-U catalyzed tandem hydrogen transfer-cyclization for the synthesis of quinolines. Standard conditions: 2-nitrobenzyl alcohol (1, 0.5 mmol), alcohol (2, 1.1 mmol), Co-N/C-U (5 mg), THF (3.0 mL), at 80 °C for 3 h.