1-Benzyl 3-(4-methoxyphenyl)methyl (3RS,4SR)-3-[2-(tert-butoxy)-2-oxoethyl]-4-methylpyrrolidine-1,3-dicarboxylate → 1-benzyl 3-(4-methoxyphenyl)methyl (3R*,4S*)-3-[2-(tert-butoxy)-2-oxoethyl]-4-methylpyrrolidine-1,3-dicarboxylate
Reaktionsgleichung
[C:1]([O:5][C:6](=[O:36])[CH2:7][C:8]1([C:24]([O:26][CH2:27][C:28]2[CH:33]=[CH:32][C:31]([O:34][CH3:35])=[CH:30][CH:29]=2)=[O:25])[CH:12]([CH3:13])[CH2:11][N:10]([C:14]([O:16][CH2:17][C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)=[O:15])[CH2:9]1)([CH3:4])([CH3:3])[CH3:2]>CCCCCC.C(O)C>[C:1]([O:5][C:6](=[O:36])[CH2:7][C@@:8]1([C:24]([O:26][CH2:27][C:28]2[CH:33]=[CH:32][C:31]([O:34][CH3:35])=[CH:30][CH:29]=2)=[O:25])[C@H:12]([CH3:13])[CH2:11][N:10]([C:14]([O:16][CH2:17][C:18]2[CH:19]=[CH:20][CH:21]=[CH:22][CH:23]=2)=[O:15])[CH2:9]1)([CH3:4])([CH3:2])[CH3:3]Komponenten
3
Edukt 1
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
1-Benzyl 3-(4-methoxyphenyl)methyl (3RS,4SR)-3-[2-(tert-butoxy)-2-oxoethyl]-4-methylpyrrolidine-1,3-dicarboxylate obtained in Example 4c (12.7 g, 26 mmol) was optically resolved repeatedly by HPLC (CHIRALPAK AD-H (2 cm diameter×25 cm), elution solvent: hexane/ethanol=85/15, flow rate: 8-10 ml/min.) to give a chiral form corresponding to the peak with a shorter retention time (5.7 g, yield: 44.9%). The resulting chiral form (5.3 g) was further purified by silica gel column chromatography (elution solvent; heptane/ethyl acetate) in two portions to give 5.2 g of the title compound.