Iodoethane → [(4S,5R)-5-ethyl-1,4-dimethyl-4-(3-nitro-phenyl)-6-oxo-1,4,5,6-tetrahydro-pyrimidin-2-yl]-carbamic acid tert-butyl ester

HRID 1255794Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1255794
[C:1]([O:5][C:6](=[O:26])[NH:7][C:8]1[N:9]([CH3:25])[C:10](=[O:24])[CH2:11][C@@:12]([CH3:23])([C:14]2[CH:19]=[CH:18][CH:17]=[C:16]([N+:20]([O-:22])=[O:21])[CH:15]=2)[N:13]=1)([CH3:4])([CH3:3])[CH3:2].[Li+].[CH3:28][CH:29]([N-]C(C)C)C.ICC>C1COCC1>[C:1]([O:5][C:6](=[O:26])[NH:7][C:8]1[N:9]([CH3:25])[C:10](=[O:24])[C@H:11]([CH2:28][CH3:29])[C@@:12]([CH3:23])([C:14]2[CH:19]=[CH:18][CH:17]=[C:16]([N+:20]([O-:22])=[O:21])[CH:15]=2)[N:13]=1)([CH3:4])([CH3:3])[CH3:2]

Komponenten

5

Edukt 3

HCID 6340IodoethaneHCID 2724682Lithium diisopropylamideHCID 57496576[(S)-1,4-dimethyl-4-(3-nitro-phenyl)-6-oxo-1,4,5,6-tetrahydro-pyrimidin-2-yl]-carbamic acid tert-butyl ester2×

Produkt 1

HCID 57496603[(4S,5R)-5-ethyl-1,4-dimethyl-4-(3-nitro-phenyl)-6-oxo-1,4,5,6-tetrahydro-pyrimidin-2-yl]-carbamic acid tert-butyl ester

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8028TetrahydrofuranLösungsmittel2×

Versuchsvorschrift

To a solution of [(S)-1,4-dimethyl-4-(3-nitro-phenyl)-6-oxo-1,4,5,6-tetrahydro-pyrimidin-2-yl]-carbamic acid tert-butyl ester (165 mg, intermediate E1) in THF (3.0 ml) was added at −78° C. a solution of LDA (3 eq., 2.8 ml) and stirring was continued for 1 h. The mixture was treated at −78° C. with a solution of iodoethane (67 μl) in THF (2.0 ml) and stirring was continued at the same temperature for 1.5 h and at −20° C. for 16 hours. The mixture was quenched with saturated aqueous NH4Cl, extracted with diethyl ether, the organic layer was dried and evaporated. The residue was chromatographed on silica using n-heptane/ethyl acetate (4:1) to give [(4S,5R)-5-ethyl-1,4-dimethyl-4-(3-nitro-phenyl)-6-oxo-1,4,5,6-tetrahydro-pyrimidin-2-yl]-carbamic acid tert-butyl ester (96 mg) as a colorless foam. MS (ESI): m/z=391.3 [ M+H]+. The hydrogenation of the nitro group to give the aniline (intermediate F) was carried out as described in Scheme 1.

Aufarbeitung

  1. stirringstirring
  2. waitwas continued at the same temperature for 1.5 h and at −20° C. for 16 hours
  3. customThe mixture was quenched with saturated aqueous NH4Cl
  4. extractionextracted with diethyl ether
  5. customthe organic layer was dried
  6. customevaporated
  7. customThe residue was chromatographed on silica

Quellen und Nachweise

ORD-Eintrag
ord-71e3a0cbeda54cba9fbc2db3bb465d21
Quelldatensatz
uspto-grants-2013_06
Patentnummer
US08461160B2

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