tert-Butyl carbazate → tert-Butyl (3SR,5SR)-3-(2-chloro-4-fluorophenyl)-5-hydroxy-2-oxopiperidin-1-ylcarbamate

반응식

[Cl:1][C:2]1[CH:7]=[C:6]([F:8])[CH:5]=[CH:4][C:3]=1[CH:9]([CH2:14][CH:15]1[CH2:17][O:16]1)[C:10]([O:12]C)=O.[C:18]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])(=[O:21])[NH:19][NH2:20]>CC(O)C.C(OC(=O)C)C>[Cl:1][C:2]1[CH:7]=[C:6]([F:8])[CH:5]=[CH:4][C:3]=1[CH:9]1[CH2:14][CH:15]([OH:16])[CH2:17][N:20]([NH:19][C:18](=[O:21])[O:22][C:23]([CH3:26])([CH3:25])[CH3:24])[C:10]1=[O:12]

참가 물질

실험 절차

To a solution of methyl 2-(2-chloro-4-fluorophenyl)-3-(oxiran-2-yl)propanoate (4.56 g, 17.6 mmol) in 2-propanol (20 mL) was added tert-butyl carbazate (2.3 g, 17.6 mmol) and the reaction heated to reflux for 16 hours. The reaction was then concentrated to dryness, redissolved in toluene (20 mL) and 1,5,7-triazobicylo(4.4.0)dec-5-ene (0.6 g, 4.4 mmol) was added and the mixture heated to reflux for 3 hours. The reaction was then diluted with ethylacetate, washed with 1 N HCl, dried with sodium sulfate and the solvent was evaporated in vacuo. The residue was recystallised from hot ethyl acetate to afford the title compound was obtained as a colourless solid (1.7 g, 26%). The mother liquor contained the trans isomer.