2(1H)-Pyrimidinone, tetrahydro-1,3-dimethyl- → 5(S)-[1(S)-(Boc-amino)-2-(p-benzyloxyphenyl)-ethyl]-3(R)-(p-benzyloxyphenylmethyl)-dihydrofuran-2-(3H)-one
Reaktionsgleichung
[C:1]([NH:8][C@H:9]([C@H:25]1[O:29][C:28](=[O:30])[CH2:27][CH2:26]1)[CH2:10][C:11]1[CH:16]=[CH:15][C:14]([O:17][CH2:18][C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=2)=[CH:13][CH:12]=1)([O:3][C:4]([CH3:7])([CH3:6])[CH3:5])=[O:2].CN1CCCN(C)C1=O.C[Si]([N-][Si](C)(C)C)(C)C.[Li+].[CH2:50]([O:57][C:58]1[CH:65]=[CH:64][C:61]([CH2:62]I)=[CH:60][CH:59]=1)[C:51]1[CH:56]=[CH:55][CH:54]=[CH:53][CH:52]=1>C1COCC1>[C:1]([NH:8][C@H:9]([C@H:25]1[O:29][C:28](=[O:30])[C@H:27]([CH2:62][C:61]2[CH:64]=[CH:65][C:58]([O:57][CH2:50][C:51]3[CH:56]=[CH:55][CH:54]=[CH:53][CH:52]=3)=[CH:59][CH:60]=2)[CH2:26]1)[CH2:10][C:11]1[CH:16]=[CH:15][C:14]([O:17][CH2:18][C:19]2[CH:20]=[CH:21][CH:22]=[CH:23][CH:24]=2)=[CH:13][CH:12]=1)([O:3][C:4]([CH3:6])([CH3:7])[CH3:5])=[O:2]Komponenten
6
Edukt 4
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
Analogously to Example 21 D) 1)c), 2.47 g (6.0 mmol) of 5(S)-[1(S)-(Boc-amino)-2-(p-benzyloxyphenyl)ethyl]-dihydrofuran-2-(3H)-one (Example 46 c)) dissolved in 12 ml of THF and 1.2 ml of 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone are deprotonated at -70° C. with 11.73 ml of lithium bis(trimethylsilyl)amide 1M in THF and alkylated (60 min) with 1.946 g (6.0 mmol) of p-benzyloxybenzyl iodide (Example 44a)) in 3 ml of THF. Column chromatography (SiO2, hexane/ethyl acetate 4:1) and crystallisation from ethyl acetate/hexane yields the pure title compound: TLC Rf (D)=0.45; tRet (I)=19.9 min; FAB-MS (M+H)+ =608.
Aufarbeitung
- custom(60 min)
- customColumn chromatography (SiO2, hexane/ethyl acetate 4:1) and crystallisation from ethyl acetate/hexane
Quellen und Nachweise
- ORD-Eintrag
- ord-d712656313174fa891581520ea0c5fbc
- Quelldatensatz
- uspto-grants-1997_07
- Patentnummer
- US05643878
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