Dimethyl Sulfoxide → 2-(3-Bromophenyl)-1,2,5-thiadiazolidine 1,1-dioxide

A solution of SO2Cl2 (12.6 mL, 0.155 mol) and 2-chloroethylamine hydrochloride (3.0 g, 25.9 mmol) in CH3CN (100 mL) was stirred at 75° C. for 16 hr. The solution was concentrated and the residue dried in vacuo. The residue was then extracted with two 15 mL portions of Et2O and the combined washes then added dropwise to a solution of 3-bromoaniline (1.70 mL, 15.5 mmol) and TEA (7.20 mL, 51.7 mmol) in Et2O (15 mL) at −78° C. After stirring at room temperature for 16 hr, the mixture was diluted with EtOAc then washed with H2O and brine, dried over Na2SO4 and concentrated. To the residue was added DMSO (100 mL) and K2CO3 (3.60 g, 26.0 mmol). After stirring at room temperature for 2 hr the mixture was poured into H2O (500 mL), extracted twice with EtOAc and the combined organics washed with H2O and brine then concentrated. The residue was recrystallized from EtOAc/hexanes to give 2-(3-bromophenyl)-1,2,5-thiadiazolidine 1,1-dioxide as a light brown solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 3.48-3.49 (m, 2H), 3.82-3.85 (m, 2H), 7.15 (d, J=8.0 Hz, 1H), 7.23 (d, J=8.0 Hz, 1H), 7.29-7.33 (m, 2H), 7.85 (br s, 1H).

1. concentrationThe solution was concentrated
2. customthe residue dried in vacuo
3. extractionThe residue was then extracted with two 15 mL portions of Et2O
4. washthen washed with H2O and brine
5. dry with materialdried over Na2SO4
6. concentrationconcentrated
7. stirringAfter stirring at room temperature for 2 hr the mixture
8. extractionextracted twice with EtOAc
9. washthe combined organics washed with H2O and brine
10. concentrationthen concentrated
11. customThe residue was recrystallized from EtOAc/hexanes

ORD record

ord-95870d7292ad4080ade7b339d2b4f63f

Source dataset

uspto-grants-2014_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08822518B2