Acetyl chloride → p-Nitrobenzyl 7-phenoxyacetamido-3-acetoxy-methyl-2-cephem-4-carboxylate

HRID 437344Notes

Reaction equation

[O:1]([CH2:8][C:9]([NH:11][CH:12]1[C:34](=[O:35])[N:14]2[CH:15]([C:21]([O:23][CH2:24][C:25]3[CH:30]=[CH:29][C:28]([N+:31]([O-:33])=[O:32])=[CH:27][CH:26]=3)=[O:22])[C:16](=C)[CH2:17][S:18](=O)[C@H:13]12)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[C:36]([O:39]C(=O)C)(=[O:38])[CH3:37].[C:43](Cl)(=O)C>C1(C)C=CC=CC=1>[O:1]([CH2:8][C:9]([NH:11][CH:12]1[C:34](=[O:35])[N:14]2[CH:15]([C:21]([O:23][CH2:24][C:25]3[CH:30]=[CH:29][C:28]([N+:31]([O-:33])=[O:32])=[CH:27][CH:26]=3)=[O:22])[C:16]([O:39][C:36](=[O:38])[CH3:37])=[C:17]([CH3:43])[S:18][C@H:13]12)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

Conditions

Temperature: 111 °C

Procedure

To 10 ml. of dry toluene were added 500 mg. (1 millimole) of p-nitrobenzyl 7-phenoxyacetamido-3-methylenecepham-4-carboxylate-1-oxide. To the resulting mixture then were added 2 ml. of acetic anhydride and 0.071 ml. (1 equivalent based upon the cepham sulfoxide) of acetyl chloride. The resulting mixture was refluxed at 111° C. for 5 hours to obtain almost complete conversion of the methylenecepham sulfoxide to p-nitrobenzyl 7-phenoxyacetamido-3-acetoxy-methyl-2-cephem-4-carboxylate as well as a minor amount of the corresponding Δ3 isomer.

Workup

additionTo the resulting mixture then were added 2 ml

Sources & evidence

ORD record: ord-d35d1f655b4a49dc89f2439cedaba4fa
Source dataset: uspto-grants-1977_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04031082

Reaction notes

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