Ammonium Chloride → ethyl N-(4-propoxyphenylmethyl)piperidin-4-ylcarboxylate

Temperatur

40 °C

A solution of 47.5 grams (0.30 mole) of ethyl piperidin-4-ylcarboxylate in 70 mL (0.40 mole) of N,N-diisopropylethylamine was stirred, and a solution of 52.5 grams (0.29 mole) of 4-propoxyphenylmethyl chloride in 50 mL of dimethyl sulfoxide was added dropwise. The reaction caused the reaction mixture temperature to rise to about 35° C. Upon completion of the addition the reaction mixture was stirred for 30 minutes, warmed to 40° C., and then allowed to cool to ambient temperature. After this time the reaction mixture was poured into 500 mL of aqueous 10% ammonium chloride. The mixture was extracted with three 250 mL portions of diethyl ether, and the combined extracts were washed with two 250 mL portions of an aqueous solution saturated with ammonium chloride, one 250 mL portion of water, and one 250 mL portion of an aqueous solution saturated with sodium chloride. The organic layer was dried with magnesium sulfate and filtered. The filtrate was concentrated under reduced pressure, yielding 80.0 grams of ethyl N-(4-propoxyphenylmethyl)-piperidin-4-ylcarboxylate. The NMR spectrum was consistent with the proposed structure:

1. customto rise to about 35° C
2. additionUpon completion of the addition the reaction mixture
3. temperatureto cool to ambient temperature
4. extractionThe mixture was extracted with three 250 mL portions of diethyl ether
5. washthe combined extracts were washed with two 250 mL portions of an aqueous solution saturated with ammonium chloride, one 250 mL portion of water, and one 250 mL portion of an aqueous solution saturated with sodium chloride
6. dry with materialThe organic layer was dried with magnesium sulfate
7. filtrationfiltered
8. concentrationThe filtrate was concentrated under reduced pressure

ORD-Eintrag

ord-575b21a5540d4240908c81ae4e3a86a4

Quelldatensatz

uspto-grants-1998_08

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05795901