Ammonia → HCID 18681020, compound

To a stirred suspension of sodium 3-(methylthio)propane-1-sulfonate (20 g) in dry DCM (200 mL), is added dropwise oxalyl chloride (80 mL) at 0° C. After stirring at room temperature for 3 h, the reaction mixture is concentrated under reduced pressure and ice (100 g) is added. The product is extracted with DCM (2×200 mL) and the organic phase is washed with brine then dried over Na2SO4. The solvent is removed under reduced pressure to afford 12 g of 3-(Methylthio)propane-1-sulfonyl chloride as colorless liquid. A solution of 3-(methylthio)propane-1-sulfonyl chloride (12 g) in dry THF (100 mL) is added dropwise to a solution of ammonia in dry THF (250 mL) at −78° C. After stirring at room temperature for 3 h, the reaction mixture is concentrated under reduced pressure. The residue is purified by chromatography using silica gel (60-120 mesh) and CHCl3/MeOH as eluent to afford 9 g (84%) of the title compound as pale a yellow solid. 1H NMR (DMSO-d6, 400 MHz) δ 6.80 (br s, 2H), 3.02-3.06 (m, 2H), 2.55-2.59 (m, 2H), 2.03 (s, 3H), 1.89-1.92 (m, 2H).

1. concentrationthe reaction mixture is concentrated under reduced pressure
2. customThe residue is purified by chromatography

ORD record

ord-e5369d2ab5b04253ba3b4d3d8f5f5d2b

Source dataset

uspto-grants-2013_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08614215B2