Ethanol → HCID 21472069, compound

35.1 g (200 mmole) of 4,5,6,7-tetrahydrothieno[3,2-c]pyridine hydrochloride and 38.57 g (200 mmole) of 28% w/v sodium methoxide in methanol were added to 200 ml of ethanol, and the resulting mixture was stirred at room temperature for 1 hour. The inorganic salt thus precipitated was filtered off, and the filtrate was concentrated to dryness by evaporation under reduced pressure. 50 ml of acetic anhydride were added all at once, whilst stirring, to the residue, and the resulting mixture was stirred at room temperature for 1 hour. The reaction mixture was then concentrated to dryness by evaporation under reduced pressure, and the residue thus obtained was subjected to silica gel column chromatography, using a 6:4 by volume mixture of toluene and ethyl acetate as the eluent, to give 29.32 g of the title compound as a yellow oil.

1. customThe inorganic salt thus precipitated
2. filtrationwas filtered off
3. concentrationthe filtrate was concentrated to dryness by evaporation under reduced pressure
4. addition50 ml of acetic anhydride were added all at once,
5. stirringwhilst stirring, to the residue
6. stirringthe resulting mixture was stirred at room temperature for 1 hour
7. concentrationThe reaction mixture was then concentrated to dryness by evaporation under reduced pressure
8. customthe residue thus obtained

ORD record

ord-3aaa243104e34a08a493e70eee2a686c

Source dataset

uspto-grants-1994_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05288726