Diisopropyl Ether → 2-(2-Formamidothiazol-4-yl)-2-(propargyloxyimino)acetic acid

Participants

Reaction Conditions

Reaction Steps

Formic acid (107 g) was added to acetic anhydride (239 g) under ice-cooling, and the mixture was stirred for 1 hour at 50° C. and then cooled to 20° C. To the mixture was added 2-(2-propynyloxyimino)-2-(2-aminothiazol-4-yl)acetic acid (syn isomer) (135 g), and the mixture was stirred for 3 hours at ambient temperature. To the mixture was added diisopropyl ether (400 ml) and then the precipitated crystals were collected by filtration, washed with diisopropyl ether and then dried to give 2-(2-propynyloxyimino)-2-(2-formylaminothiazol-4-yl)acetic acid (syn isomer) (118.4 g).

Provenance & Evidence