Table 5. Aerobic oxidative synthesis of pyridine derivatives with CuMnFe-LDHzyme/DDQ^a and CuMnFe-LDHzyme/4-phenyl urazole^b catalytic system.

Entry	Substrate	Product	DDQ		4-Phenyl urazole
			Time (h)	Yield (%)	Time (h)	Yield (%)
1			18	98	15	98
2			16	98	14	98
3			16	98	14	98
4			16	90	14.5	95
5			20	60	19	68
6			23	76	21	85
7			23	80	20	90
9			24	53	24	68

^aReaction conditions: substrate (1 mmol), CuMnFe-LDHzyme (130 mg), DDQ (10 mol%), CH₃CN (3 mL) under O₂ (balloon).

^bSubstrate (1 mmol), CuMnFe-LDHzyme (110 mg), 4-phenyl urazole (10 mol%), CH₃CN (3 mL) under O₂ (balloon).