Hydrochloric Acid → HCID 19041003, compound

Participants

Reaction Steps

A solution of 0.32 g of sodium hydroxide dissolved in 20 ml of ethanol and 20 ml of water was added to 0.54 g of 2-(3,4-diethoxyphenyl)-4-(5-hydroxy-6-ethoxycarbonyl-2-pyridyl)thiazole. The mixture was refluxed for 2.5 hours. To the reaction mixture was added 100 ml of water. The mixture was made acidic with concentrated hydrochloric acid and subjected to extraction four times with 70 ml of ethyl acetate. The solvent in the extract was removed and the resulting residue was recrystallized from ethyl acetate-diethyl ether to obtain 0.24 g of 2-(3,4-diethoxyphenyl)-4-(5-hydroxy-6-carboxy-2-pyridyl)thiazole. m.p.: 161.4°-162° C.

Provenance & Evidence