Hydrochloric Acid → HCID 68814486, compound

Participants

Reaction Steps

Dissolve 5-(2-methylpropenyl)-isophthalic acid diethyl ester (535 mg, 1.94 mmol) in acetone (10 mL) and add a solution of NaOH (77 mg, 1.94 mmol) in methanol (2 mL). Stir at room temperature 2 days and concentrate. Dissolve in water and wash with diethyl ether. Acidify the water layer to about pH=1 with 1 N HCl and extract with dichloromethane. Dry the dichloromethane layer over magnesium sulfate, filter and concentrate. Dissolve the residue in DMF (10 mL) and add 1-(3-dimnethylamino-propyl)-3-ethyl-carbodiimide hydrochloride (409 mg, 2.13 mmol) and 1-hydroxybenzotriazole (288 mg, 2.13 mmol). After 30 min, add methyl-propyl-amine (283 mg, 3.87 mmol) and triethylamine (665 mg, 6.58 mmol) in DMF (2 mL). Stir at room temperature 1 h and dilute with ethyl acetate. Wash with 10% aqueous potassium carbonate, 0.1 N citric acid, 1 N lithium chloride and saturated aqueous sodium chloride and concentrate. Dissolve the residue in THF (20 mL) and add 1 N lithium hydroxide (10 mL, 10 mmol). Stir at room temperature for 4 h and acidify to about pH=1 with 1 N HCl. Extract with dichloromethane, dry (magnesium sulfate), filter and concentrate to give the title compound as a solid (220 mg, 41%).

Provenance & Evidence