反应详情

Dry methylene chloride (30 ml) and triethylamine (0.33 ml, 2.34 mmole) are added to a mixture of 2,3-diethyl-4-methoxynaphthol (180 mg, 0.78 mmole), dimethylamino propionic acid hydrochloride (2 eq, 283 mg, 1.56 mmole), dicyclohexylcarbodiimide (2 eq, 322 mg, 1.56 mmole) and 4-dimethylaminpyridine (1 eq, 95 mg, 0.78 mmole) at room temperature under argon, and the resulting suspension is stirred at room temperature under argon for two days. The white precipitate is removed by filtration, and the filtrate is concentrated. Thick layer chromatography (silica gel, 2000 micron) developed by a 9:1 mixture of ether and n-hexane isolates 144 mg (51.8% ) of 3-(N,N-diethylamino) propionic acid, 2,3-diethyl-4-methoxynaphth-1-yl ester as a colorless oil.

1. customThe white precipitate is removed by filtration
2. concentrationthe filtrate is concentrated
3. additionThick layer chromatography (silica gel, 2000 micron) developed by a 9:1 mixture of ether and n-hexane