Methanamine, N-methoxy-, hydrochloride (1:1) → HCID 84557435, compound

Participants

Reaction Conditions

Reaction Steps

To a cooled (−30° C. to −20° C.) slurry of methyl 4,5-dimethylthiophene-3-carboxylate (5.44 g, 32.0 mmol) and N,O-dimethylhydroxylamine hydrochloride (4.80 g, 49.2 mmol) in THF (45 mL) at was added slowly (over 15 min) a solution of isopropylmagnesium bromide (3.85 mL, 11.16 mmol, 2.9 M) in 2-methyl-tetrahydrofuran. After complete addition of the base, the reaction mixture was warmed to 0° C. and partitioned between 1 N HCl (55 mL) and MTBE (50 mL). The aqueous phase was extracted with MTBE (2×) and the combined organic layer was washed with water (until the pH of the aqueous was ˜5). The organic layer was dried over Na2SO4 and concentrated to give a light yellow oil. The crude product was purified on Biotage system (gradient elution 7% EtOAc:93% Hexanes to 60% EtOAc:40% Hexanes) to give the titled compound as a yellow oil (5.17 g, 25.9 mmol, 81% yield). LC/MS m/z 200 [M+H]+.

Provenance & Evidence