Sodium Chloride → Cilostamide

Participants

Reaction Steps

2.5 Grams of 6-(3-carboxy)propoxycarbostyril and 1.8 ml of pyridine are added to 50 ml of tetrahydrofuran, and then 1.0 ml of methyl bromoformate is added dropwise to said solution under external ice cooling and agitation while maintaining the internal temperature at 5°-15° C. after addition, the mixture is further agitated at room temperature for 1 hour and then added with 1.2 g of N-methylcyclohexylamine, followed by additional 3-hour agitation. The reaction solution is poured into 200 ml of saturated NaCl solution and the precipitated crystals are filtered out and washed with water. The obtained crude crystals are recrystallized from chloroform-ethanol to obtain 2.3 g of 6-[3-(N-methyl-N-cyclohexylaminocarbonyl)propoxy]carbostyril in the form of colorless needle-like crystals with m.p. of 184.5°-186° C.

Provenance & Evidence