Ammonia → 2,4-Dimethylthiazole-5-sulfonamide

Temperature

-78 °C

Liquid ammonia was added dropwise via a CO2/acetone condenser to a solution of 2,4-dimethylthiazole-5-sulfonyl chloride (260 mg, 1.228 mmol) in THF (3 mL) at −78° C. until the volume had approximately doubled (˜10 min). The reaction was stirred at −78° C. for 1 h and then allowed to slowly warm to rt. The reaction was concentrated to dryness and the residue was diluted with CH2Cl2. The slurry was filtered to remove the solids and the solution was concentrated to yield 2,4-dimethylthiazole-5-sulfonamide (230 mg, 1.2 mmol, 97% yield) as a light yellow solid. LC-MS retention time 0.43 min; m/z 191 (MH−). LC data was recorded on a Shimadzu LC-10AS liquid chromatograph equipped with a Phenomenex-Luna 10 u C18 3.0×50 mm column using a SPD-10AV UV-Vis detector at a detector wave length of 220 nM. The elution conditions employed a flow rate of 5 ml/min, a gradient of 100% solvent A/0% solvent B to 0% solvent A/100% solvent B, a gradient time of 3 min, a hold time of 1 min, and an analysis time of 4 min where solvent A was 5% acetonitrile/95% H2O/10 mM ammonium acetate and solvent B was 5% H2O/95% acetonitrile/10 mM ammonium acetate. MS data was determined using a Micromass Platform for LC in electrospray mode.

1. custom(˜10 min)
2. temperatureto slowly warm to rt
3. concentrationThe reaction was concentrated to dryness
4. additionthe residue was diluted with CH2Cl2
5. filtrationThe slurry was filtered
6. customto remove the solids
7. concentrationthe solution was concentrated

ORD record

ord-c97b1b4cc3f54cae92d661eb8934a48c

Source dataset

uspto-grants-2012_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08129367B2