Dimethyl Sulfoxide → 2,2,2-Trichloroethyl 3-hydroxy-3-methyl-7-(2-phenylacetamido)cepham-4-carboxylate

HRID 2083162Notes

Reaction equation

HRID 2083162 reaction equation
Br[CH2:2][C:3]1([CH3:29])[CH:7]([C:8]([O:10][CH2:11][C:12]([Cl:15])([Cl:14])[Cl:13])=[O:9])[N:6]2[C:16](=[O:28])[CH:17]([NH:18][C:19](=[O:27])[CH2:20][C:21]3[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=3)[C@H:5]2[S:4]1.C(N(CC)CC)C.CS(C)=[O:39]>F[B-](F)(F)F.[Ag+]>[OH:39][C:3]1([CH3:2])[CH:7]([C:8]([O:10][CH2:11][C:12]([Cl:15])([Cl:14])[Cl:13])=[O:9])[N:6]2[C:16](=[O:28])[CH:17]([NH:18][C:19](=[O:27])[CH2:20][C:21]3[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=3)[C@H:5]2[S:4][CH2:29]1

Participants

5

Reactant 3

HCID 679Dimethyl Sulfoxide2×HCID 8471TriethylamineHCID 128952622,2,2-Trichloroethyl 2-bromomethyl-2-methyl-6-(2-phenylacetamido)penam-3-carboxylate

Product 1

HCID 705904572,2,2-Trichloroethyl 3-hydroxy-3-methyl-7-(2-phenylacetamido)cepham-4-carboxylateYield 58%

Reagents, catalysts & solvents 1

HCID 159722Silver tetrafluoroborateCatalyst

Procedure

2,2,2-Trichloroethyl 2-bromomethyl-2-methyl-6-(2-phenylacetamido)penam-3-carboxylate (0.54 g) was dissolved in absolute dimethylsulfoxide (5 ml). To this solution was added silver fluoroborate (0.20 g) and then the mixture was stirred under shielding from light for 3 hours at room temperature. To the solution was added a solution of triethylamine (0.1 g) in dimethylsulfoxide (0.5 ml) and the solution was further stirred for 5 hours and then allowed to stand overnight at room temperature. Precipitates were filtered off and the filtrate was poured into ice-water and then extracted with ethyl acetate. The extract was washed with water and dried. The residue obtained by distilling off the solvent under reduced pressure was crystallized by a small amount of ether to give colorless crystals of 2,2,2-trichloroethyl 3-hydroxy-3-methyl-7-(2-phenylacetamido)cepham-4-carboxylate (280 mg) (58%). This substance was recrystallized from a mixed solvent of benzene-n-hexane to give colorless needles melting at 169° to 171° C.

Workup

  1. stirringthe solution was further stirred for 5 hours
  2. waitto stand overnight at room temperature
  3. customPrecipitates
  4. filtrationwere filtered off
  5. additionthe filtrate was poured into ice-water
  6. extractionextracted with ethyl acetate
  7. washThe extract was washed with water
  8. customdried
  9. customThe residue obtained
  10. distillationby distilling off the solvent under reduced pressure
  11. customwas crystallized by a small amount of ether

Sources & evidence

ORD record
ord-4b09f66c512b4c079404dd557c205708
Source dataset
uspto-grants-1978_04
Patent number
US04084049

Reaction notes

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