反应详情

Into a 25 mL three-necked flask under a nitrogen atmosphere, equipped with a magnetic stirrer, are placed 270 mg (0.57 mmol) of ethyl 4″-diethylamino-3″-ethyl-4′-(3-hydroxypropoxy)-[1,1′;3′,1″]terphenyl-4-carboxylate (Example 10d) and 22 mg (5.7 mmol) of solid sodium hydroxide in 5.4 mL of tetrahydrofuran. The reaction medium is heated at the reflux temperature of the tetrahydrofuran for 5 hours. The reaction medium is concentrated under vacuum. The crude reaction product obtained is taken up in water and the pH of the medium thus obtained is adjusted to pH=4 by addition of hydrochloric acid solution in a proportion of 1 mol/L. The precipitate obtained, after stirring for 30 minutes, is purified by chromatography on silica (eluent: 40/60 heptane/ethyl acetate) to give, after evaporation of the fractions, 80 mg (yield=31%) of 4″-diethylamino-3″-ethyl-4′-(3-hydroxypropoxy)-[1,1′;3′,1″]terphenyl-4-carboxylic acid in the form of a cream-colored powder (m.p.=204° C.).

1. customInto a 25 mL three-necked flask under a nitrogen atmosphere, equipped with a magnetic stirrer
2. concentrationThe reaction medium is concentrated under vacuum
3. customThe crude reaction product
4. customobtained
5. customthe pH of the medium thus obtained
6. customThe precipitate obtained
7. customis purified by chromatography on silica (eluent: 40/60 heptane/ethyl acetate)
8. customto give