反应详情

To 700 ml of dimethylformamide, 249 g (1.22 mol) of 1,4-dihydroxy-2-naphthoic acid was added, and the mixture was stirred under a nitrogen atmosphere. To the mixture, 490 ml (2.44 mols) of a 28% solution of sodium methoxide in methanol was added dropwise over 20 minutes. After 10 minutes, 150 g (1.22 mol) of ethyl chloroacetate was added dropwise over 30 minutes, and the mixture was stirred for 3 hours while keeping the temperature at 50° C. The reaction solution was poured into a mixture of 160 ml of concentrated chloric acid and 5 l of iced water, and the precipitated crystals were filtered off and dried to obtain 335 g (95% yield) of 1-hydroxy-4-ethoxycarbonylmethyloxy-2-naphthoic acid.

1. stirringthe mixture was stirred for 3 hours
2. customat 50° C
3. filtrationthe precipitated crystals were filtered off
4. customdried