Potassium Carbonate → 1-propan-2-yloxycarbonyloxyethyl (6R,7R)-7-[[(2Z)-2-(2-amino-1,3-thiazol-4-yl)-2-methoxyiminoacetyl]amino]-8-oxo-3-[(2S)-oxolan-2-yl]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate

HRID 376595Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 376595
I[CH:2]([O:4][C:5]([O:7][CH:8]([CH3:10])[CH3:9])=[O:6])[CH3:3].[NH2:11][C:12]1[S:13][CH:14]=[C:15](/[C:17](=[N:38]/[O:39][CH3:40])/[C:18]([NH:20][C@@H:21]2[C:36](=[O:37])[N:23]3[C:24]([C:33]([O-:35])=[O:34])=[C:25]([C@@H:28]4[CH2:32][CH2:31][CH2:30][O:29]4)[CH2:26][S:27][C@H:22]23)=[O:19])[N:16]=1.[Na+].C(=O)([O-])[O-].[K+].[K+]>CN1CCCC1=O.C(OCC)(=O)C>[NH2:11][C:12]1[S:13][CH:14]=[C:15](/[C:17](=[N:38]/[O:39][CH3:40])/[C:18]([NH:20][C@@H:21]2[C:36](=[O:37])[N:23]3[C:24]([C:33]([O:35][CH:2]([O:4][C:5]([O:7][CH:8]([CH3:10])[CH3:9])=[O:6])[CH3:3])=[O:34])=[C:25]([C@@H:28]4[CH2:32][CH2:31][CH2:30][O:29]4)[CH2:26][S:27][C@H:22]23)=[O:19])[N:16]=1

Komponenten

6

Edukt 3

HCID 11430Potassium CarbonateHCID 110106451-Iodoethyl isopropyl carbonateHCID 23690298Cefovecin sodium

Produkt 1

HCID 1415822621-propan-2-yloxycarbonyloxyethyl (6R,7R)-7-[[(2Z)-2-(2-amino-1,3-thiazol-4-yl)-2-methoxyiminoacetyl]amino]-8-oxo-3-[(2S)-oxolan-2-yl]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylateAusbeute 19,9 %

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 8857Ethyl AcetateLösungsmittelHCID 13387N-methyl-2-pyrrolidoneLösungsmittel2×

Versuchsvorschrift

A solution of (RS)-1-iodo-1-(propan-2-yl)oxycarbonyloxyethane (516mg) in 1-methyl-2-pyrrolidinone (2ml) was added dropwise over 45 mins to an ice-cold mixture of sodium (6R,7R)-7-[2-(2-aminothiazol-4-yl)-2-(Z)-methoxyiminoacetamido]-3-[(S) -tetrahydrofuran-2-yl]ceph-3-em-4-carboxylate (237mg) and finely powdered potassium carbonate (276mg) in 1-methyl-2-pyrrolidinone (5ml). The mixture was stirred for an additional 15 mins, diluted with ethyl acetate, washed with water, brine, dried (magnesium sulphate), concentrated and flash chromatographed on silica gel eluting with 50, 60, 70, 80% ethyl acetate in hexane to give the title compound as a foam (58mg); vmax (CHCl3) 2960, 1787, 1760, 1682, 1633, 1519 and 1377cm-1 ; δ(CDCl3, 250MHz) 1.20-2.50 (13H, m), 3.35-3.80 (2H, m), 3.80-4.20 (2H, m), 4.22 (3H, s), 4.83-5.10 (2H, m), 5.85-6.00 (1H, m), 6.85-7.08 (1H, m), 7.27 (1H, s) and 7.76 (1H, br, m). [Mass spectrum: +ve ion (3-nitrobenzyl alcohol, sodium acetate) MNa+ (606)].

Aufarbeitung

  1. washwashed with water, brine
  2. dry with materialdried (magnesium sulphate)
  3. concentrationconcentrated
  4. customflash chromatographed on silica gel eluting with 50, 60, 70, 80% ethyl acetate in hexane

Quellen und Nachweise

ORD-Eintrag
ord-be0e1741156d4b7685ce58cabd7ead6a
Quelldatensatz
uspto-grants-2000_02
Patentnummer
US06020329

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