Hydrochloric Acid → Ethanone, 2-chloro-1-(tetrahydro-2-furanyl)- (9CI)

Oxalyl chloride (5.2 ml, 60 mmol) and DMF (1 drop) were added to (RS)-2-tetrahydrofuroic acid (W. E. Kaufmann and R. Adams, J.Amer.Chem.Soc., 1923, 45, 3029) (4.64 g, 40 mmol) in dichloromethane (25 ml). The mixture was stirred 1 h, evaporated in vacuo, dichloromethane added and reevaporated to give 2-tetrahydrofuroyl chloride, νmax (CH2Cl2) 1795 cm-1. 2-Tetrahydrofuroyl chloride in ether (25 ml) and dichloromethane (10 ml) was added dropwise to an ice bath cooled solution of diazomethane (ca 80 mmol) in ether (150 ml). The reaction mixture was stirred 0.25 h then a stream of hydrogen chloride gas passed into the solution for ca 2 minutes then stirred a further 0.25 h, washed with saturated brine, dried, concentrated and flash chromatographed on silica gel eluting with 5, 7.5 and 10% ethyl acetate in hexane to provide the title compound (2.46 g, 41%); (Found: M+, 148.0279. C6H9ClO2 requires M, 148.0291); νmax (CH2Cl2) 1739, 1395, 1071 and 936 cm-1 ; δH (CDCl3, 250 MHz) 1.8-2.4 (4H, m) and 3.9-4.6 (5H, m).

1. stirringthen stirred a further 0.25 h
2. washwashed with saturated brine
3. customdried
4. concentrationconcentrated
5. customflash chromatographed on silica gel eluting with 5, 7.5 and 10% ethyl acetate in hexane

ORD record

ord-6038f4d955324541a5747349c3b72a34

Source dataset

uspto-grants-2000_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06077952