2,2'-Bipyridine → HCID 46911037, compound

HRID 2274348Notes

Reaction equation

HRID 2274348 reaction equation
[Cl:1][C:2]1[CH:3]=[C:4]([CH:8]([OH:25])[CH2:9][O:10][C:11]2[CH:24]=[CH:23][C:14]([CH:15]=[C:16]3[S:20][C:19](=[O:21])[NH:18][C:17]3=[O:22])=[CH:13][CH:12]=2)[CH:5]=[CH:6][CH:7]=1.N1C=CC=CC=1C1C=CC=CN=1.[BH4-].[Na+].[BH4-]>C1COCC1.[Co](Cl)Cl.CC(O)=O.O>[Cl:1][C:2]1[CH:3]=[C:4]([CH:8]([OH:25])[CH2:9][O:10][C:11]2[CH:24]=[CH:23][C:14]([CH2:15][CH:16]3[S:20][C:19](=[O:21])[NH:18][C:17]3=[O:22])=[CH:13][CH:12]=2)[CH:5]=[CH:6][CH:7]=1

Participants

9

Reactant 4

HCID 14742,2'-BipyridineHCID 28123BorohydrideHCID 4311764Sodium borohydrideHCID 86645080HCID 86645080, compound

Product 1

HCID 46911037HCID 46911037, compoundYield 59%

Reagents, catalysts & solvents 4

HCID 24288Cobalt(II) chlorideCatalystHCID 176Acetic AcidSolventHCID 962WaterSolventHCID 8028TetrahydrofuranSolvent2×

Conditions

Temperature
0 °C

Procedure

5-{4-[2-(3-chlorophenyl)-2-hydroxyethoxy]benzylidene}-1,3-thiazolidine-2,4-dione (0.74 g, 2.00 mmol) was dissolved in THF (20 mL). Water (20 mL) was added and then more THF was added until all solids dissolved. A small crystal of cobalt chloride was added, followed by 2,2′-bipyridine (69 mg, 0.44 mmol). The reaction mixture was cooled to 0° C. NaBH4 was added in portions until the blue color persisted. The color gradually faded and was regenerated repeatedly by small additions of borohydride and HOAc. When HPLC indicated that the reaction was complete, the reaction mixture was partitioned between EtOAc and H2O. HOAc was added until the pH of the aqueous phase was ca. 6, and then the aqueous phase was extracted with EtOAc. The combined organic phases were washed with brine, dried (Na2SO4), filtered and evaporated in vacuo. The residue was chromatographed on a small silica gel column eluting with 0-10% EtOAc/DCM. Fractions containing product were combined and evaporated in vacuo to give 0.44 g (59%) of a sticky yellow solid. MS (ESI−) for C18H16ClNO4S m/z 376.1 (M−H)−.

Workup

  1. dissolutiondissolved
  2. customthe reaction mixture was partitioned between EtOAc and H2O
  3. additionHOAc was added until the pH of the aqueous phase
  4. extractionthe aqueous phase was extracted with EtOAc
  5. washThe combined organic phases were washed with brine
  6. dry with materialdried (Na2SO4)
  7. filtrationfiltered
  8. customevaporated in vacuo
  9. customThe residue was chromatographed on a small silica gel column
  10. washeluting with 0-10% EtOAc/DCM
  11. additionFractions containing product
  12. customevaporated in vacuo

Sources & evidence

ORD record
ord-611e2fca32ce45d3887b068c83217b83
Source dataset
uspto-grants-2015_09
Patent number
US09126959B2

Reaction notes

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