Table 1.

DDQ-catalyzed oxidative cyclization reactions.^a

entry	substrate	product	time (h)	yield (%)b
1			41	76
2			44	83
3			40	92
4c			48	75
5			36	68
6			24	87
7			40	70
8			30	81
9		–	–	–

^aRepresentative procedure: DDQ was added in three equal portions over the course of the reaction (0.15 equiv total) to a suspension of the substrate, 2,6-dichloropyridine (2 equiv), and activated MnO₂ (6 equiv) in CH₃NO₂ (0.1 M). The reaction stirred at room temperature for the indicated period of time.

^bYields refer to isolated, purified products.

^cReaction required 0.2 equiv DDQ.