反应详情

A sodium methoxide solution prepared from 3.46 g (0.15 mole) of sodium and 150 ml of absolute methanol is added dropwise at 40° C in the course of 1 hour to a solution of 312 g (0.15 mole) of methyl 2,6-dichloronicotinate in 100 ml of methanol. The reaction mixture is refluxed for 3 hours and the solvent is then evaporated in vacuo. The dry residue is triturated with methylene chloride, the undissolved constituents are filtered off and the filtrate is evaporated in vacuo to dryness. The crystallised residue is recrystallised from petroleum ether to yield pure methyl 2-methoxy-6-chloronicotinate with a melting point of 68°-69° C.

1. temperatureThe reaction mixture is refluxed for 3 hours
2. customthe solvent is then evaporated in vacuo
3. customThe dry residue is triturated with methylene chloride
4. filtrationthe undissolved constituents are filtered off
5. customthe filtrate is evaporated in vacuo to dryness
6. customThe crystallised residue is recrystallised from petroleum ether