Cesium carbonate → HCID 58292666, compound

HRID 1798161Notes

Reaction equation

HRID 1798161 reaction equation
[OH:1][B:2]1[C:6]2[CH:7]=[C:8]([OH:12])[CH:9]=[C:10]([CH3:11])[C:5]=2[CH:4]([CH2:13][C:14]([O:16][CH2:17][CH3:18])=[O:15])[O:3]1.Cl[C:20]1[CH:25]=[CH:24][N:23]=[C:22]([N+:26]([O-:28])=[O:27])[CH:21]=1.C(=O)([O-])[O-].[Cs+].[Cs+]>CN(C=O)C>[OH:1][B:2]1[C:6]2[CH:7]=[C:8]([O:12][C:20]3[CH:25]=[CH:24][N:23]=[C:22]([N+:26]([O-:28])=[O:27])[CH:21]=3)[CH:9]=[C:10]([CH3:11])[C:5]=2[CH:4]([CH2:13][C:14]([O:16][CH2:17][CH3:18])=[O:15])[O:3]1

Participants

5

Reactant 3

HCID 10796Cesium carbonateHCID 27628474-chloro-2-nitropyridineHCID 58292549Ethyl 2-(1,6-dihydroxy-4-methyl-1,3-dihydrobenzo[c][1,2]oxaborol-3-yl)acetate

Product 1

HCID 58292666HCID 58292666, compound

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Procedure

To a mixture of ethyl 2-(1,6-dihydroxy-4-methyl-1,3-dihydrobenzo[c][1,2]oxaborol-3-yl)acetate (2 g, 8 mmol, 1 eq.) and 4-chloro-2-nitropyridine (2.53 g, 16 mmol, 2 eq.) in 50 ml of DMF was added cesium carbonate (7.8 g, 24 mmol, 3 eq.). The reaction was stirred at room temperature overnight. It was then quenched by water, extracted with EtOAc, washed with brine, dried over Na2SO4, and concentrated under reduced pressure. The crude was purified by column chromatography on silica gel (DCM/methanol=19:1 to 4:1) to give desired product as light yellow oil. MS (ESI) m/z=743 [2M−H]+.

Workup

  1. customIt was then quenched by water
  2. extractionextracted with EtOAc
  3. washwashed with brine
  4. dry with materialdried over Na2SO4
  5. concentrationconcentrated under reduced pressure
  6. customThe crude was purified by column chromatography on silica gel (DCM/methanol=19:1 to 4:1)

Sources & evidence

ORD record
ord-74154f53fcdd4e2caebb28aa66a3f2a4
Source dataset
uspto-grants-2013_01
Patent number
US08343944B2

Reaction notes

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