Thiourea → 4-Nitrobenzyl 7-[2-(2-amino-4-thiazolyl)-2-methoxyiminoacetamido]-3-cephem-4-carboxylate

HRID 621341Notes

Reaction equation

HRID 621341 reaction equation
[NH2:1][C:2]([NH2:4])=[S:3].Br[CH2:6][C:7]([C:9](=[N:35][O:36][CH3:37])[C:10]([NH:12][CH:13]1[C:33](=[O:34])[N:15]2[C:16]([C:20]([O:22][CH2:23][C:24]3[CH:29]=[CH:28][C:27]([N+:30]([O-:32])=[O:31])=[CH:26][CH:25]=3)=[O:21])=[CH:17][CH2:18][S:19][C@H:14]12)=[O:11])=O>C(O)C.O>[NH2:1][C:2]1[S:3][CH:6]=[C:7]([C:9](=[N:35][O:36][CH3:37])[C:10]([NH:12][CH:13]2[C:33](=[O:34])[N:15]3[C:16]([C:20]([O:22][CH2:23][C:24]4[CH:29]=[CH:28][C:27]([N+:30]([O-:32])=[O:31])=[CH:26][CH:25]=4)=[O:21])=[CH:17][CH2:18][S:19][C@H:14]23)=[O:11])[N:4]=1

Participants

5

Reactant 2

HCID 2723790ThioureaHCID 1317124944-Nitrobenzyl 7-[2-(2-bromoacetyl)-2-methoxyiminoacetamido]-3-cephem-4-carboxylate

Product 1

HCID 1317124504-Nitrobenzyl 7-[2-(2-amino-4-thiazolyl)-2-methoxyiminoacetamido]-3-cephem-4-carboxylateYield 27.4%

Reagents, catalysts & solvents 2

HCID 702EthanolSolventHCID 962WaterSolvent

Procedure

Thiourea (0.14 g.) was added to a solution of 4-nitrobenzyl 7-[2-(2-bromoacetyl)-2-methoxyiminoacetamido]-3-cephem-4-carboxylate (syn isomer: 0.8 g.) in ethanol (20 ml.) and water (5 ml.), and stirred at room temperature for 3.5 hours. The resultant solution was concentrated under reduced pressure, and to the residue were added water and ethyl acetate. The ethyl acetate layer was separated, washed with water, dried over magnesium sulfate and concentrated under reduced pressure to give the crude product (0.6 g.) The product was purified by column chromatography on silica gel (eluent: benzene and ethyl acetate (8:2) to give 4-nitrobenzyl 7-[2-(2-amino-4-thiazolyl)-2-methoxyiminoacetamido]-3-cephem-4-carboxylate (syn isomer: 0.21 g.), mp 165° to 170° C. (dec.)

Workup

  1. concentrationThe resultant solution was concentrated under reduced pressure
  2. additionto the residue were added water and ethyl acetate
  3. customThe ethyl acetate layer was separated
  4. washwashed with water
  5. dry with materialdried over magnesium sulfate
  6. concentrationconcentrated under reduced pressure
  7. customto give the crude product (0.6 g.) The product
  8. customwas purified by column chromatography on silica gel (eluent

Sources & evidence

ORD record
ord-e3433b772a65446b84683a98f1489be7
Source dataset
uspto-grants-1989_04
Patent number
US04822888

Reaction notes

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