Methanamine, N-methoxy-, hydrochloride (1:1) → 1-dimethylsulfamoyl-1H-pyrazole-3-carboxylic acid methoxy-methyl-amide

Participants

Reaction Conditions

Reaction Steps

1-Dimethylsulfamoyl-1H-pyrazole-3-carboxylic acid methyl ester (4 g, 17.15 mmol) and N,O-dimethylhydroxylamine hydrochloride (2.18 g, 22.29 mmol) were slurried in DCM (20 mL). The mixture was flushed with nitrogen and cooled to −78° C. Then a solution of isopropylmagnesium chloride (2M in THF) (24.01 mL, 48.02 mmol) was added dropwise. When the addition was completed the mixture was allowed to warm to room temperature and stirred overnight. The mixture was quenched with NH4Cl (aq. sat. solution) and the product was extracted with AcOEt. The organic layer was separated, dried (MgSO4), filtered and the solvents evaporated in vacuo. The crude product was purified by flash column chromatography (silica gel; AcOEt in DCM 0/100 to 100/0). The desired fractions were collected and concentrated in vacuo to yield 1-dimethylsulfamoyl-1H-pyrazole-3-carboxylic acid methoxy-methyl-amide (3.2 g, 71% yield) as a pale yellow oil.

Provenance & Evidence