Sodium Hydroxide → 3-(1-(3-(Thioxanthen-9-ylidene)-1-propyl)piperidin-4-yl)propionic acid acetate

A mixture of ethyl 3-(1-(3-(thioxanthen-9-ylidene)-1-propyl)piperidin-4-yl)propionate (as the free base released from the above hydrogen oxalate; 3.71 g, 0.0088 mol), 4 N sodium hydroxide (10 ml) and 96% ethanol (70 ml) was stirred at room temperature overnight. Ethanol was evaporated in vacuo, the residue was dissolved in water (50 ml) and the aqueous solution was washed with diethyl ether (50 ml). The aqueous phase was neutralised with acetic acid and extracted with dichloromethane (3×150 ml). The combined dichloromethane extracts tracts were dried (MgSO4) and evaporated in vacuo. The residue was dissolved in acetone (30 ml), the solution was diluted with diethyl ether (30 ml) and the mixture was stirred for 1 h. The precipitated solid was filtered off, washed with acetone and dried in vacuo, affording 2.24 g (56%) of the title compound.

1. customEthanol was evaporated in vacuo
2. dissolutionthe residue was dissolved in water (50 ml)
3. washthe aqueous solution was washed with diethyl ether (50 ml)
4. extractionextracted with dichloromethane (3×150 ml)
5. dry with materialwere dried (MgSO4)
6. customevaporated in vacuo
7. dissolutionThe residue was dissolved in acetone (30 ml)
8. additionthe solution was diluted with diethyl ether (30 ml)
9. filtrationThe precipitated solid was filtered off
10. washwashed with acetone
11. customdried in vacuo

ORD record

ord-65bb4b7117894c50910dff040ea4b677

Source dataset

uspto-grants-2000_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06114354