反应详情

A mixture of 2-hydroxy6-chloropyridine (0.84 g, 6.5 mmol), sodium hydroxide (0.275 g, 6.9 mmol) and 15-crown-5 (1 drop) in dry toluene (15 ml) were stirred at reflux for 1.5 hours. The toluene was removed under reduced pressure and the white salt residue was dissolved in dry DMF (10 ml). Methyl 2-bromomethylphenylacetate (1.5 g, 6.2 mmol) in dry DMF (10 ml) was added dropwise along with sodium iodide (10 mg). The mixture was stirred at room temperature for 2 hours, poured into water and extracted with diethyl ether. The ether extracts were washed with water, dried and the ether removed in vacuo leaving a yellow oil which was purified by column chromatography (silica eluted with 10 % ethyl acetate in hexane) to give methyl 2-(6-chloropyrid-2-yloxymethyl)phenylacetate (1.11 g, 61%) (Compound No. 1 in Table 1) as a pale yellow oil; 1H NMR(270 MHz)δ:3.67(3H,s), 3.82(2H,s), 5.39(2H,s) 6.65(1H,d), 6.90(1H,d), 7.25-7.55(5H,m) ppm.

1. temperatureat reflux for 1.5 hours
2. customThe toluene was removed under reduced pressure
3. dissolutionthe white salt residue was dissolved in dry DMF (10 ml)
4. stirringThe mixture was stirred at room temperature for 2 hours
5. extractionextracted with diethyl ether
6. washThe ether extracts were washed with water
7. customdried
8. customthe ether removed in vacuo
9. customleaving a yellow oil which
10. customwas purified by column chromatography (silica eluted with 10 % ethyl acetate in hexane)