Hydrochloric Acid → HCID 12893157, compound

Participants

Reaction Steps

A mixture of 2-(2-aminothiazol-4-yl)glycine ethyl ester (24.2 g) and 2 N aqueous solution of sodium hydroxide (7.2 g) in methanol (240 ml) was stirred at ambient temperature for an hour. After adjusting to pH 7 with conc. hydrochloric acid, water (250 ml), and then 2-tert-butoxycarbonyloxyimino-2-phenylacetonitrile (29.5 g) and triethylamine (18.2 g) were added thereto. After stirring at ambient temperature for an hour, the reaction mixture was evaporated. The resultant aqueous solution was washed twice with ethyl acetate, followed by adding ethyl acetate and adjusting to pH 7 with 10% hydrochloric acid. After removal of the insoluble substance by filtration, the aqueous layer was separated out, adjusted to pH 4 with 10% hydrochloric acid and treated with activated charcoal. To the filtrate was added sodium chloride, followed by stirring under ice-cooling. The precipitated solid was collected by filtration and dried to give N-tert-butoxycarbonyl-2-(2-aminothiazol-4-yl)glycine (10.2 g).

Provenance & Evidence