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% 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レコード

ord-287e6e1972b642a4ba649f8fce04c64b

出典データセット

uspto-grants-1990_12

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US04975438