Hexamethylphosphoramide → Benzhydryl 7-(2-thienylacetamido)-3-(4-hydroxybutanoyloxymethyl)-2-cephem-4-carboxylate

HRID 259396

Reaktionsgleichung

Reaktionsgleichung von HRID 259396
[S:1]1[CH:5]=[CH:4][CH:3]=[C:2]1[CH2:6][C:7]([NH:9][CH:10]1[C:35](=[O:36])[N:12]2[C:13]([C:19]([O:21][CH:22]([C:29]3[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=3)[C:23]3[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=3)=[O:20])=[C:14]([CH2:17]Br)[CH2:15][S:16][C@H:11]12)=[O:8].CN(C)P(N(C)C)(N(C)C)=O.[OH:48][CH2:49][CH2:50][CH2:51][C:52]([O-:54])=[O:53].[Na+]>C(OCC)(=O)C>[S:1]1[CH:5]=[CH:4][CH:3]=[C:2]1[CH2:6][C:7]([NH:9][CH:10]1[C:35](=[O:36])[N:12]2[CH:13]([C:19]([O:21][CH:22]([C:29]3[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=3)[C:23]3[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=3)=[O:20])[C:14]([CH2:17][O:54][C:52](=[O:53])[CH2:51][CH2:50][CH2:49][OH:48])=[CH:15][S:16][C@H:11]12)=[O:8]

Komponenten

5

Edukt 3

HCID 12679Hexamethylphosphoramide2×HCID 23663870Sodium OxybateHCID 70634766Benzhydryl 7-(2-thienylacetamido)-3-bromomethyl-3-cephem-4-carboxylate

Produkt 1

HCID 131710853Benzhydryl 7-(2-thienylacetamido)-3-(4-hydroxybutanoyloxymethyl)-2-cephem-4-carboxylate

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8857Ethyl AcetateLösungsmittel

Versuchsvorschrift

To a solution of 2.24 g. (3.8 mmol) of benzhydryl 7-(2-thienylacetamido)-3-bromomethyl-3-cephem-4-carboxylate in 20 ml. of hexamethylphosphoramide (HMPA) at 0° C. under nitrogen was added a suspension of 0.530 g. (4.2 mmol) of sodium 4-hydroxybutanoate in 25 ml. of HMPA. After stirring 1.5 hours, ethyl acetate was added, and the resulting solution was washed with water (5X) and brine and dried over anhydrous MgSO4. Evaporation in vacuo to dryness provided 2.12 g. of product which was combined with that of an identical reaction ran on a 1 mmol scale. The combined products were chromatographed on a silica gel column using a cyclohexane:ethyl acetate (1:2) eluant to provide 293 mg. of a mixture of the title product and the corresponding 3-cephem compound. For the title product: nmr (CDCl3) δ1.7-2.6 ##STR26## 3.55 (m, 2, CH2OH), 3.83 (s, 2, side chain CH2), 4.63 (bs, 1, --CH2OH), 5.0 (s, 1, C4 --H), 5.23 (d, 1, J = 4 Hz, C6 --H), 5.58 (dd, 1, J = 4 and 8 Hz, C7 --H), 6.42 (bs, 1, C2 --H), 6.95 (s, 1, ester CH), and 7.36 (m, 13, thienyl + ArH).

Aufarbeitung

  1. additiona suspension of 0.530 g
  2. washthe resulting solution was washed with water (5X) and brine
  3. dry with materialdried over anhydrous MgSO4
  4. customEvaporation in vacuo to dryness
  5. customprovided 2.12 g
  6. customof an identical reaction
  7. customThe combined products were chromatographed on a silica gel column
  8. customto provide 293 mg

Quellen und Nachweise

ORD-Eintrag
ord-eaf780383c304188828ec1b9c6543e33
Quelldatensatz
uspto-grants-1977_07
Patentnummer
US04038275

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