Z-Thr(Bzl)-OH → HCID 18639971, Verbindung
Reaktionsgleichung
[CH2:1]([O:8][C@H:9]([CH3:25])[C@@H:10]([C:22]([OH:24])=[O:23])[NH:11][C:12]([O:14][CH2:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1)=[O:13])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[F:26][C:27]([F:46])([F:45])[C:28]([NH:30][C@H:31]([C:35]([O:37][CH2:38][C:39]1[CH:44]=[CH:43][CH:42]=[CH:41][CH:40]=1)=[O:36])[CH2:32][CH2:33]O)=[O:29]>C(Cl)Cl>[CH2:1]([O:8][C@H:9]([CH3:25])[C@@H:10]([C:22]([O:24][CH2:33][CH2:32][C@@H:31]([C:35]([O:37][CH2:38][C:39]1[CH:40]=[CH:41][CH:42]=[CH:43][CH:44]=1)=[O:36])[NH:30][C:28](=[O:29])[C:27]([F:46])([F:26])[F:45])=[O:23])[NH:11][C:12]([O:14][CH2:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1)=[O:13])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1Komponenten
4
Edukt 2
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
To a solution of O-benzyl-N-benzyloxycarbonyl-L-threonine (1.5 g), benzyl N-trifluoroacetyl-L-homoserinate (1.34 g) and 4-N,N-dimethylaminopyridine (48.8 mg) in methylene chloride (30 ml) was added N,N-diethylaminopropyl-N'-ethylcarbodiimide hydrochloride (840 mg) at 0° C. After stirring for an hour at room temperature, the reaction mixture was concentrated. The residue was dissolved in ethyl acetate and washed successively with 0.1N hydrochloric acid, water, 10% aqueous sodium hydrogen carbonate, water and brine. After drying over sodium sulfate, the ethyl acetate extract was filtered and concentrated. The residue was chromatographed on silica gel eluting successively with a 1:1 mixture of methylene chloride and hexane, methylene chloride and a 50:1 mixture of methylene chloride and acetone (50:1) to give benzyl O-(O-benzyl-N-benzyloxycarbonyl-L-threonyl)-N-trifluoroacetyl-L-homoserinate (1.6 g).