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

Table 1

Effects of [bmim]OH/solvent on the synthesis of DVDPA.

Entry	Catalyst/solvent	Yield (%)
	[bmim]OH/H2O	62
	[bmim]OH/CH3OH	83
	[bmim]OH/CH3CN	80
	[bmim]OH/CH2Cl2	71
	[bmim]OH/None	60

Reaction conditions: CMDPA (25 mmol), tetrahydrofuran 60 ml, [bmim]OH (2.5 mmol), 60°C, 40 min. yield.