Thionyl Chloride → 4H,5H,6H-cyclopenta[b]thiophen-4-one

To a solution of 3-thiophene-2-yl-propionic acid (Intermediate AC) (1.75 g, 0.01122 mol) in dichloromethane (50 mL) was added SOCl2 (1.67 mL, 0.02244 mol) and stirred at room temperature for 6 h. This solution was added dropwise to a suspension of AlCl3 (2.98 g, 0.02244 mol) in dichloromethane (50 mL) over 45 minutes. The resulting mixture was stirred at room temperature for 12 h. The system was quenched by dropwise addition of water (10 mL) and extracted with dichloromethane. The organics were dried with MgSO4 and the solvent was removed in vacuo. The title compound was purified by silica gel column chromatography using 4:1 Hexanes:ethyl acetate as the eluent. MS m/z 139.1 (M+H)+;

1. stirringThe resulting mixture was stirred at room temperature for 12 h
2. customThe system was quenched by dropwise addition of water (10 mL)
3. extractionextracted with dichloromethane
4. dry with materialThe organics were dried with MgSO4
5. customthe solvent was removed in vacuo
6. customThe title compound was purified by silica gel column chromatography

ORD record

ord-2b8097230eff4caa89330849dacfd9c5

Source dataset

uspto-grants-2010_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07795440B2