Chlorosuccinimide → HCID 12774965, compound

HRID 847693Notes

Reaction equation

HRID 847693 reaction equation
[C:1]1([CH2:7][C:8]([NH:10][C@H:11]2[C:35](=[O:36])[N:13]3[C:14]([C:19]([O:21][CH:22]([C:29]4[CH:34]=[CH:33][CH:32]=[CH:31][CH:30]=4)[C:23]4[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=4)=[O:20])=[C:15]([CH3:18])[CH2:16][S:17][C@H:12]23)=[O:9])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.ClN1[C:42](=[O:43])CCC1=O>CO.C(Cl)Cl>[C:1]1([CH2:7][C:8]([NH:10][C@H:11]2[C:35](=[O:36])[N:13]3[C:14]([C:19]([O:21][CH:22]([C:23]4[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=4)[C:29]4[CH:30]=[CH:31][CH:32]=[CH:33][CH:34]=4)=[O:20])=[C:15]([CH3:18])[C@@H:16]([O:43][CH3:42])[S:17][C@H:12]23)=[O:9])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1

Participants

5

Reactant 2

HCID 31398ChlorosuccinimideHCID 70532880HCID 70532880, compound

Product 1

HCID 12774965HCID 12774965, compoundYield 21%

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 6344DichloromethaneSolvent

Procedure

To a solution of diphenylmethyl 7α-phenylacetamido-3-methyl-3-cephem-4-carboxylate (2.88 g, 5.8 mmole) in 40 ml of methanol and 60 ml of methylene chloride, was added N-chlorosuccinimide (882 mg, 6.6 mmol) and the mixture was stirred for 90 minutes at room temperature. The reaction solution was then washed with brine (2X) and dried over magnesium sulfate, filtered and the solvent was evaporated under reduced pressure. The resultant yellow foam (2.84 g) was chromatographed over 100 grams of silica gel employing 10-15% of ethyl acetate in toluene as the eluting solvent. The first fraction to elute from the column was the desired 2α-methoxy cephem compound which was subsequently recrystallized from a mixture of ethyl acetate and cyclohexane to give pure diphenylmethyl 7α-phenylacetamido-2α-methoxy-3-methyl-3-cephem-4-carboxylate. (638 mg, 21% yield) (m.p. 144°-145° C.) i.r. (CHCl3) 1780, 1725 and 1680 cm-1 ; n.m.r. (CDCl 3) δ 1.95 (s, 3, CH3) 3.35 (s, 3, OCH3), 3.45 (s, 2, CH2Ph), 4.60 (s, 1, C2 -H), 4.70 (d, J=2 and 8 Hz, 1, C7 -H), 4.85 (d, J=2 Hz, 1, C6 -H), 6.95 (s, 1, CH2Ph), 7.3 (m, 16, aromatic H and N-H); u.v. (CHCl3) λmax 264 nm (ε=9726).

Workup

  1. washThe reaction solution was then washed with brine (2X)
  2. dry with materialdried over magnesium sulfate
  3. filtrationfiltered
  4. customthe solvent was evaporated under reduced pressure
  5. customThe resultant yellow foam (2.84 g) was chromatographed over 100 grams of silica gel employing 10-15% of ethyl acetate in toluene as the eluting solvent
  6. washThe first fraction to elute from the column
  7. customwas subsequently recrystallized from a mixture of ethyl acetate and cyclohexane

Sources & evidence

ORD record
ord-c523f9cca89743d69fdd748879914176
Source dataset
uspto-grants-1981_10
Patent number
US04293495

Reaction notes

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