Ammonia → 4-Pyridinepropaneamide

The crude ester was dissolved in 250 mL of 7.1M methanolic ammonia solution and was stirred at room temperature for 65 hours. After the solvent and excess ammonia were removed by distillation under reduced pressure, the residue was dissolved in 150 mL of 1N HCl and extracted with dichloromethane to remove residual triphenylphosphine oxide. The aqueous phase was basified with 40 mL of 4N NaOH and then was extracted with ethyl acetate 5×300 mL). The dried (Na2SO4) extracts were evaporated to furnish 6 g of the amide. The aqueous layer was concentrated to dryness and triturated with tetrahydrofuran (4×100 mL) and evaporation of the tetrahydrofuran extracts yielded an additional 5 g of amide. The combined crude products were dried, triturated with ether and the solids were filtered to yield 10.7 g of 4-pyridinepropanamide, mp 164°-166° C.

1. customAfter the solvent and excess ammonia were removed by distillation under reduced pressure
2. dissolutionthe residue was dissolved in 150 mL of 1N HCl
3. extractionextracted with dichloromethane
4. customto remove residual triphenylphosphine oxide
5. extractionwas extracted with ethyl acetate 5×300 mL)
6. dry with materialThe dried (Na2SO4) extracts
7. customwere evaporated

ORD record

ord-6d6bb1fbc0344aa19aa880b14f45aeb0

Source dataset

uspto-grants-1988_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04788206