Hydrochloric Acid → 2-[1-(1-pyrrolidinyl)ethyl]pyridine

Ml 11.2 (0.1 moles) of 2-acetylpyridine (commercial product) and ml.16.5 (0.2 moles) of pyrrolidine were dissolved in ml.120 of dry methanol, and the solution was brought to pH 8 by adding HCl dissolved in methanol. Gr.9.4 (0.15 moles) of NaCNBH3 were added in small portions and the reaction mixture stirred 48 hours at room temperature. The mixture was brought to strongly basic pH by adding aqueous 20% NaOH, a small amount of insoluble filtered off, and the filtrate concentrated to small volume i.v. The residue was taken up in ether, the phases separated, and the aqueous layer extracted with ether. The combined ether solutions were washed with 20% aqueous Na OH, saturated aqueous NaCl and finally dried on NaOH pellets and evaporated to dryness i.v. 23 g. of red oil were obtained, and were chromatographed on 120 g. of silicagel, eluting with CH2Cl2 containing increasing amounts of metanol (0.5% to 8%). Gr 16 of oily product were obtained, sufficiently pure for the subsequent step.

1. concentrationa small amount of insoluble filtered off, and the filtrate concentrated to small volume i.v
2. customthe phases separated
3. extractionthe aqueous layer extracted with ether
4. washThe combined ether solutions were washed with 20% aqueous Na OH, saturated aqueous NaCl
5. customfinally dried on NaOH pellets
6. customevaporated to dryness i.v
7. customof red oil were obtained
8. customwere chromatographed on 120 g
9. washof silicagel, eluting with CH2Cl2 containing
10. temperatureincreasing amounts of metanol (0.5% to 8%)
11. customGr 16 of oily product were obtained, sufficiently pure for the subsequent step

ORD record

ord-f94bea4c5f7a4338b28914320488b78b

Source dataset

uspto-grants-1989_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04879300