Cesium carbonate → 2-(4-Cyano-phenyl)-4-{[(2,4-dimethoxy-benzyl)-ethoxycarbonylmethyl-amino]-methyl}-thiazole-5-carboxylic acid ethyl ester

HRID 642356Notes

Reaction equation

HRID 642356 reaction equation
[CH2:1]([O:3][C:4]([C:6]1[S:10][C:9](Br)=[N:8][C:7]=1[CH2:12][N:13]([CH2:20][C:21]1[CH:26]=[CH:25][C:24]([O:27][CH3:28])=[CH:23][C:22]=1[O:29][CH3:30])[CH2:14][C:15]([O:17][CH2:18][CH3:19])=[O:16])=[O:5])[CH3:2].[C:31]([C:33]1[CH:38]=[CH:37][C:36](B(O)O)=[CH:35][CH:34]=1)#[N:32].C(=O)([O-])[O-].[Cs+].[Cs+]>O1CCOCC1.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH2:1]([O:3][C:4]([C:6]1[S:10][C:9]([C:36]2[CH:37]=[CH:38][C:33]([C:31]#[N:32])=[CH:34][CH:35]=2)=[N:8][C:7]=1[CH2:12][N:13]([CH2:20][C:21]1[CH:26]=[CH:25][C:24]([O:27][CH3:28])=[CH:23][C:22]=1[O:29][CH3:30])[CH2:14][C:15]([O:17][CH2:18][CH3:19])=[O:16])=[O:5])[CH3:2]

Participants

6

Reactant 3

HCID 10796Cesium carbonateHCID 27343264-Cyanophenylboronic acidHCID 684264542-Bromo-4-{[(2,4-dimethoxy-benzyl)-ethoxycarbonylmethyl-amino]-methyl}-thiazole-5-carboxylic acid ethyl ester

Product 1

HCID 684265452-(4-Cyano-phenyl)-4-{[(2,4-dimethoxy-benzyl)-ethoxycarbonylmethyl-amino]-methyl}-thiazole-5-carboxylic acid ethyl esterYield 35.8%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 312751,4-DioxaneSolvent

Procedure

A mixture of 2-bromo-4-{[(2,4-dimethoxy-benzyl)-ethoxycarbonylmethyl-amino]-methyl}-thiazole-5-carboxylic acid ethyl ester (1.19 g, 2.39 mmole), 4-cyanophenylboronic acid (702 mg, 4.77 mmole), cesium carbonate (2.33 g, 7.16 mmole) and tetrakis(triphenylphosphine)palladium (221 mg, 0.19 mmole) in dioxane (8 ml) was refluxed for 18 h before it was cooled to room temperature, quenched with water and filtered. The filtrate was partitioned between ethyl acetate and water. The organic layer was washed with brine, dried over anhydrous sodium sulfate and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel with a gradient of ethyl acetate and hexanes to give the title compound as a yellow oil (448 mg). MS: (+) m/z 524.30 (M+H+)

Workup

  1. temperaturewas refluxed for 18 h before it
  2. customquenched with water
  3. filtrationfiltered
  4. customThe filtrate was partitioned between ethyl acetate and water
  5. washThe organic layer was washed with brine
  6. dry with materialdried over anhydrous sodium sulfate
  7. concentrationconcentrated in vacuo
  8. customThe residue was purified by flash column chromatography on silica gel with a gradient of ethyl acetate and hexanes

Sources & evidence

ORD record
ord-d2a7892cd33a48e08376fc81bd63e958
Source dataset
uspto-grants-2010_04
Patent number
US07696223B2

Reaction notes

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