Methanamine, N-methoxy-, hydrochloride (1:1) → HCID 86697887, compound

Participants

Reaction Steps

To a stirred solution of 5-fluorothiophene-2-carboxylic acid (33.95 g, 232.3 mmol) in tetrahydrofuran (465 mL) at 0° C. under nitrogen is added N,O-dimethylhydroxylamine hydrochloride (45.32 g, 464.6 mmol), 1-hydroxybenzotriazole monohydrate (53.36 g, 348.5 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (89.1 g, 464.6 mmol), and diisopropylethylamine (162 mL, 929 mmol). The mixture is allowed to warm to room temperature over 18 hours. The mixture is diluted with water (500 mL) and extracted with ethyl acetate (500 mL). The aqueous phase is re-extracted twice with ethyl acetate (300 mL). The combined organic extracts are dried over sodium sulfate, filtered, and concentrated under reduced pressure. The liquid residue is purified by silica gel chromatography eluting with hexanes/ethyl acetate (3:1) to give the title compound (38.28 g, 87%) as a pale yellow liquid. ES/MS (m/e): 190 (M+H).

Provenance & Evidence