1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → HCID 54466640, compound

Participants

Reaction Steps

A stirred solution of [3-methoxy-4-(3-o-tolylureido)phenyl]-acetic acid (7.53 g, Reference Example 5) in a mixture of dimethylformamide (15 ml) and dichloromethane (150 ml) was treated with 1-(3-dimethylaminoprop-1-yl)-3-ethylcarbodiimide (4.98 g), then with 1-hydroxybenzotriazole (3.57 g), then with glycine methyl ester hydrochloride (3.01 g) and then with diisopropylethylamine (4.10 ml). After stirring at room temperature for 20 hours the reaction mixture was diluted with water (100 ml). The organic phase was washed with saturated sodium bicarbonate (100 ml), then with hydrochloric acid (1M) and then with brine, then dried over magnesium sulphate and then evaporated. The residue was triturated with petroleum ether and the resulting cream coloured solid (6.25 g) was dissolved in tetrahydrofuran (200 ml). The solution was treated with water (50 ml) and then with lithium hydroxide hydrate (0.75 g). The mixture was stirred at room temperature for 4 hours and then the tetrahydrofuran was removed under vacuum. The aqueous phase was acidified by addition of hydrochloric acid (12M). The resulting solid was washed with diethyl ether and then dried to give the title compound (5.76 g), m. p. 130-134° C. (with decomposition). MS: 370 [M−1]−. HPLC: RT=10.16 minutes (gradient clution using a mixture of acetonitrile and water 4:1 to 1:4 v/v).

Provenance & Evidence