Diisopropylethylamine → HCID 178424382, compound

Participants

Reaction Steps

A mixture of 5-amino-(pyrid-2-yl)-thioacetic acid methyl ester [930 mg, Reference Example 1(a)], 4-[3-(2-methylphenyl)ureido]phenylacetic acid (1.26 g, prepared as described in Example 21 of International Patent Application Publication No. WO 96/22966), O-(7-azabenzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate (1.69 g) and diisopropylethylamine (1.2 g) in dimethylformamide (50 ml) was stirred at ambient temperature for 1 hour. The mixture was evaporated then poured into water (500 ml). The resultant solid was washed with water (50 ml) and then washed twice with diethyl ether (50 ml). The solid was suspended in methanol (100 ml), then treated with sodium hydroxide solution (10 ml, 1M). The mixture was heated at reflux for 5 hours, then cooled, then evaporated. The residue was treated with hydrochloric acid (200 ml, 1M). The resultant solid was filtered, washed with water (20 ml), then washed twice with diethyl ether (20 ml), then recrystallised from ethanol to give the title compound (220 mg) as a yellow solid, m.p. >235° C. (with decomposition). MS: MH+ 451.

Provenance & Evidence