Triethylamine → Pivaloyloxymethyl 3-methyl-7-(2-phenoxyacetamido)ceph-3-em-4-carboxylate

HRID 1702732Notes

Reaction equation

HRID 1702732 reaction equation
[CH3:1][C:2]1[CH2:3][S:4][C@@H:5]2[CH:12]([NH:13][C:14](=[O:23])[CH2:15][O:16][C:17]3[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=3)[C:11](=[O:24])[N:6]2[C:7]=1[C:8]([OH:10])=[O:9].C(N(CC)CC)C.C(=O)(O)[O-].[K+].[C:37]([O:43][CH2:44]Cl)(=[O:42])[C:38]([CH3:41])([CH3:40])[CH3:39]>CN(C)C=O>[CH3:1][C:2]1[CH2:3][S:4][C@@H:5]2[CH:12]([NH:13][C:14](=[O:23])[CH2:15][O:16][C:17]3[CH:18]=[CH:19][CH:20]=[CH:21][CH:22]=3)[C:11](=[O:24])[N:6]2[C:7]=1[C:8]([O:10][CH2:44][O:43][C:37](=[O:42])[C:38]([CH3:41])([CH3:40])[CH3:39])=[O:9]

Participants

6

Reactant 4

HCID 8471TriethylamineHCID 87885Chloromethyl pivalateHCID 516893Potassium BicarbonateHCID 155734007-Phenoxyacetamido-3-methyl-3-cephem-4-carboxylic acid

Product 1

HCID 70508460Pivaloyloxymethyl 3-methyl-7-(2-phenoxyacetamido)ceph-3-em-4-carboxylateYield 82%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

3-Methyl-7-(2-phenoxyacetamido)ceph-3-em-4-carboxylic acid (69.6 g., 0.2 mole) was dissolved in 300 ml. of dimethylformamide and reacted in sequence with triethylamine (20.2 g., 0.2 mole), potassium bicarbonate (40 g., 0.4 mole) and chloromethyl pivalate (33 g., 0.22 mole) according to procedures detailed in Preparation B 1. To isolate the product, the reaction mixture was diluted with 3 l. of ether, and the organic solution washed, dried and evaporated to dryness, as detailed in Preparation 1, affording pivaloyloxymethyl 3-methyl-7-(2-phenoxyacetamido)ceph-3-em-4-carboxylate [75.5 g., 82%; ir (CH2Cl2) 1776, 1750, 1685 cm-1 ].

Workup

  1. customdetailed in Preparation B 1
  2. customTo isolate the product
  3. additionthe reaction mixture was diluted with 3 l
  4. washof ether, and the organic solution washed
  5. customdried
  6. customevaporated to dryness
  7. customas detailed in Preparation 1

Sources & evidence

ORD record
ord-7fcf95507dd14032b6012eb0b4b9638a
Source dataset
uspto-grants-1982_09
Patent number
US04348264

Reaction notes

Loading…