Ethyl 2-oxopyrrolidine-1-acetate → cis-N-[2-(2,6-dimethyl-1-piperidinyl)ethyl]-2-oxo-1-pyrrolidineacetamide
Reaktionsgleichung
[O:1]=[C:2]1[CH2:6][CH2:5][CH2:4][N:3]1[CH2:7][C:8]([O:10]CC)=O.[CH3:13][C@H:14]1[CH2:19][CH2:18][CH2:17][C@@H:16]([CH3:20])[N:15]1[CH2:21][CH2:22][NH2:23]>>[CH3:13][C@H:14]1[CH2:19][CH2:18][CH2:17][C@@H:16]([CH3:20])[N:15]1[CH2:21][CH2:22][NH:23][C:8](=[O:10])[CH2:7][N:3]1[CH2:4][CH2:5][CH2:6][C:2]1=[O:1]Komponenten
3
Versuchsvorschrift
A mixture of 17.1 g. of ethyl 2-oxo-1-pyrrolidineacetate (U.S. Pat. No. 3,459,738) and 25.4 g. of cis-2-(2,6-dimethyl-1-piperidinyl)ethylamine (U.S. Pat. No. 3,446,811) is heated at 95°-100° C. for 16 hours. The excess cis-2-(2,6-dimethyl-1-piperidinyl)ethylamine is evaporated at reduced pressure and the residue is fractionated. The product, cis-N-[2-(2,6-dimethyl-1-piperidinyl)ethyl]-2-oxo-1-pyrrolidineacetamide, is obtained as an oil, b.p. 178°-183° C./0.15 mm., which crystallizes on standing; m.p. 93°-94.5° C. after two crystallizations from ethyl acetate-pentane.
Aufarbeitung
- addition