Potassium Carbonate → 3-[(Aminothioxomethyl)amino]benzenesulfonamide

A solution of 10 g (48 mmol) 3-Amino-benzenesulfonamide hydrochloride in 100 ml THF and 8.2 ml (48 mmol) N,N-Diisopropylethylamine was treated with 6.45 ml (48 mmol) benzoyl isothiocyanate and allowed to stir at room temperature. After evaporation to dryness the residue was suspended in diethyl ether. The precipitate was filtered off, dried and suspended in 130 ml methanol and 100 ml THF. K2CO3 (130 mmol) in 45 ml water was added and the mixture was stirred for 60 h at room temperature. The mixture was evaporated to drynes and the residue was treated with water and extracted with ethyl acetate. The combined organic layers were dried with MgSO4 filtered and evaporated to dryness. After suspending the residue in diethyl ether, filtration and drying 8.4 g (76%) of the title compound was obtained as white solid.

1. customAfter evaporation to dryness the residue
2. filtrationThe precipitate was filtered off
3. customdried
4. stirringthe mixture was stirred for 60 h at room temperature
5. customThe mixture was evaporated to drynes
6. additionthe residue was treated with water
7. extractionextracted with ethyl acetate
8. dry with materialThe combined organic layers were dried with MgSO4
9. filtrationfiltered
10. customevaporated to dryness
11. filtrationfiltration
12. dry with materialdrying 8.4 g (76%) of the title compound
13. customwas obtained as white solid

ORD record

ord-68bca33bc950417dba890518f3fdad93

Source dataset

uspto-grants-2007_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07253197B2