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Sodium Thiosulfate → (R)-tert-butyl 2-isopropyl-4-(4-(methoxycarbonyl)-5-(methylsulfonyl)-2-nitrophenyl)-3-oxopiperazine-1-carboxylate

HRID 1468889
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Reaktionsgleichung

Reaktionsgleichung von HRID 1468889
[CH:1]([C@@H:4]1[C:9](=[O:10])[N:8]([C:11]2[CH:16]=[C:15](SC)[C:14]([C:19]([O:21][CH3:22])=[O:20])=[CH:13][C:12]=2[N+:23]([O-:25])=[O:24])[CH2:7][CH2:6][N:5]1[C:26]([O:28][C:29]([CH3:32])([CH3:31])[CH3:30])=[O:27])([CH3:3])[CH3:2].[CH:33]1C=C(Cl)C=C(C(OO)=O)C=1.[O-:44][S:45]([O-:48])(=S)=O.[Na+].[Na+]>C(Cl)Cl>[CH:1]([C@@H:4]1[C:9](=[O:10])[N:8]([C:11]2[CH:16]=[C:15]([S:45]([CH3:33])(=[O:48])=[O:44])[C:14]([C:19]([O:21][CH3:22])=[O:20])=[CH:13][C:12]=2[N+:23]([O-:25])=[O:24])[CH2:7][CH2:6][N:5]1[C:26]([O:28][C:29]([CH3:32])([CH3:30])[CH3:31])=[O:27])([CH3:3])[CH3:2]
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Komponenten

5

Edukt 3

HCID 24477Sodium ThiosulfateHCID 70297m-Chloroperbenzoic acidHCID 89814992(R)-tert-butyl 2-isopropyl-4-(4-(methoxycarbonyl)-5-(methylthio)-2-nitrophenyl)-3-oxopiperazine-1-carboxylate

Produkt 1

HCID 89827918(R)-tert-butyl 2-isopropyl-4-(4-(methoxycarbonyl)-5-(methylsulfonyl)-2-nitrophenyl)-3-oxopiperazine-1-carboxylateAusbeute 85,4 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6344DichloromethaneLösungsmittel

Versuchsvorschrift

To a 2 L round-bottom flask containing (R)-tert-butyl 2-isopropyl-4-(4-(methoxycarbonyl)-5-(methylthio)-2-nitrophenyl)-3-oxopiperazine-1-carboxylate (crude 91.7 g, 0.196 mol) in CH2Cl2 (1 L) was added m-CPBA (84.6 g, 0.49 mmol, 2.5 eq). The mixture was stirred at rt overnight. Sat. Na2S2O3 solution was added slowly to quench the reaction. The mixture was extracted with CH2Cl2 (4×3 L). The combined organic layers were washed successively with Na2S2O3 solution (500 mL), NaHCO3 solution (500 mL) and brine, dried over anhydrous Na2SO4, filtered and concentrated under vacuum. The residue was purified by column chromatography on silica gel eluting with dichloromethane to give (R)-tert-butyl 2-isopropyl-4-(4-(methoxycarbonyl)-5-(methylsulfonyl)-2-nitrophenyl)-3-oxopiperazine-1-carboxylate (83.7 g, 85.4% yield) as a yellow solid. LC-MS MS (ESI) m/z 444.0 [M−56+H]+, 522.1 [M+Na]+. 1H NMR (CDCl3 300 MHz): δ 8.29 (s, 1H), 8.12 (s, 1H), 4.61-4.17 (m, 2H), 4.00-3.94 (m, 4H), 3.70-3.60 (m, 1H), 3.51-3.43 (m, 4H), 2.39-2.32 (m, 1H), 1.50 (s, 9H), 1.07 (d, J=6.9 Hz, 3H), 1.01 (d, J=6.9 Hz, 3H).

Aufarbeitung

  1. customto quench
  2. customthe reaction
  3. extractionThe mixture was extracted with CH2Cl2 (4×3 L)
  4. washThe combined organic layers were washed successively with Na2S2O3 solution (500 mL), NaHCO3 solution (500 mL) and brine
  5. dry with materialdried over anhydrous Na2SO4
  6. filtrationfiltered
  7. concentrationconcentrated under vacuum
  8. customThe residue was purified by column chromatography on silica gel eluting with dichloromethane

Quellen und Nachweise

ORD-Eintrag
ord-a65ccc2356c2489ebc70cea4ad0338ae
Quelldatensatz
uspto-grants-2015_04
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US09006244B2

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