Basic Ionic Liquid as Catalyst in Synthesis of Dimethyl 4-(2-(2,6-Bis(methoxycarbonyl)pyridine-4-yl)vinyl)pyridine-2,6-dicarboxylate

Table 3

Effect of the amount of ionic liquid [bmim]OH on the reaction.

Entry	Catalyst (mmol)	Yield (%)
	0	0
	1.0	68
	1.5	76
	2.0	81
	2.5	83
	3.0	83

Reaction conditions: CMDPA (25 mmol), tetrahydrofuran 60 ml, CH₃OH (40 ml), 60°C, 40 min. yield.