Pyridine → (3Ez,5s)-1-(biphenyl-4-ylcarbonyl)-5-{[3-(2-hydroxyethyl)-1,2,4-oxadiazol-5-yl]methyl}pyrrolidin-3-one o-methyloxime

HRID 225972Notes

Reaction equation

HRID 225972 reaction equation
[C:1]1([C:21]2[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=2)[CH:6]=[CH:5][C:4]([C:7]([N:9]2[CH2:13][C:12](=[N:14][O:15][CH3:16])[CH2:11][C@H:10]2[CH2:17][C:18](O)=[O:19])=[O:8])=[CH:3][CH:2]=1.C1N=CN(C(N2C=NC=C2)=O)C=1.O[N:40]=[C:41]([NH2:45])[CH2:42][CH2:43][OH:44].N1C=CC=CC=1>O1CCCC1>[CH3:16][O:15][N:14]=[C:12]1[CH2:11][C@@H:10]([CH2:17][C:18]2[O:19][N:45]=[C:41]([CH2:42][CH2:43][OH:44])[N:40]=2)[N:9]([C:7]([C:4]2[CH:5]=[CH:6][C:1]([C:21]3[CH:22]=[CH:23][CH:24]=[CH:25][CH:26]=3)=[CH:2][CH:3]=2)=[O:8])[CH2:13]1

Participants

6

Reactant 4

HCID 1049PyridineHCID 682631,1'-CarbonyldiimidazoleHCID 34743873,N-Dihydroxy-propionamidineHCID 131727525[(2S,4EZ)-1-(biphenyl-4-ylcarbonyl)-4-(methoxyimino)pyrrolidin-2-yl] acetic acid2×

Product 1

HCID 131727535(3Ez,5s)-1-(biphenyl-4-ylcarbonyl)-5-{[3-(2-hydroxyethyl)-1,2,4-oxadiazol-5-yl]methyl}pyrrolidin-3-one o-methyloximeYield 32.3%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

To a solution of [(2S,4EZ)-1-(biphenyl-4-ylcarbonyl)-4-(methoxyimino)pyrrolidin-2-yl]acetic acid (Intermediate 7, 50 mg, 0.14 mmol) in tetrahydrofuran (2 ml) was added CDI (37 mg, 0.23 mmol). The reaction mixture was stirred 1 h30. A solution of N′,3-dihydroxypropanimidamide (16 mg, 0.16 mmol), pyridine (34 ml, 0.14 mmol) in tetrahydrofuran was then added and the reaction mixture was stirred at reflux overnight The solvent was removed and ethyl acetate was added. The organic phase was washed with citric acid 5%, NH4Cl, NaHCO3 then brine. The organic phase was dried (MgSO4), concentrated and purified on silica gel column chromatography (Ethyl acetate) to afford (3EZ,5S)-1-(biphenyl-4-ylcarbonyl)-5-{[3-(2-hydroxyethyl)-1,2,4-oxadiazol-5-yl]methyl}pyrrolidin-3-one O-methyloxime (19 mg). Yield: 27%. HPLC purity: 94%

Workup

  1. stirringthe reaction mixture was stirred
  2. temperatureat reflux overnight The solvent
  3. customwas removed
  4. additionethyl acetate was added
  5. washThe organic phase was washed with citric acid 5%, NH4Cl, NaHCO3
  6. dry with materialThe organic phase was dried (MgSO4)
  7. concentrationconcentrated
  8. custompurified on silica gel column chromatography (Ethyl acetate)

Sources & evidence

ORD record
ord-b5b549cd351c45be97dd0f0cba5438f3
Source dataset
uspto-grants-2009_07
Patent number
US07557136B2

Reaction notes

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