Cesium carbonate → 2-[5-(3-Amino-5-methylphenyl)-1,3-thiazol-2-yl]-1-{[tert-butyl(dimethyl)silyl]oxy}propan-2-ol

HRID 1039941Notes

Reaction equation

HRID 1039941 reaction equation
[CH3:1][C:2]1[CH:3]=[C:4]([CH:6]=[C:7](B2OC(C)(C)C(C)(C)O2)[CH:8]=1)[NH2:5].Br[C:19]1[S:23][C:22]([C:24]([OH:35])([CH3:34])[CH2:25][O:26][Si:27]([C:30]([CH3:33])([CH3:32])[CH3:31])([CH3:29])[CH3:28])=[N:21][CH:20]=1.CC(C1C=C(C(C)C)C(C2C=CC=CC=2P(C2CCCCC2)C2CCCCC2)=C(C(C)C)C=1)C.C(=O)([O-])[O-].[Cs+].[Cs+]>C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd]>[NH2:5][C:4]1[CH:6]=[C:7]([C:19]2[S:23][C:22]([C:24]([OH:35])([CH3:34])[CH2:25][O:26][Si:27]([C:30]([CH3:33])([CH3:32])[CH3:31])([CH3:29])[CH3:28])=[N:21][CH:20]=2)[CH:8]=[C:2]([CH3:1])[CH:3]=1

Participants

6

Reactant 4

HCID 10796Cesium carbonateHCID 111557942-Dicyclohexylphosphino-2',4',6'-triisoprophylbiphenylHCID 672361713-Methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)anilineHCID 674313722-(5-Bromo-1,3-thiazol-2-yl)-1-{[tert-butyl(dimethyl)silyl]oxy}propan-2-ol

Product 1

HCID 584563302-[5-(3-Amino-5-methylphenyl)-1,3-thiazol-2-yl]-1-{[tert-butyl(dimethyl)silyl]oxy}propan-2-olYield 73.2%

Reagents, catalysts & solvents 1

HCID 9811564Bis(dibenzylideneacetone)palladiumCatalyst

Conditions

Temperature
110 °C

Procedure

3-methyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)aniline (69 mg, 0.296 mmol), the product of Step 2 (104 mg, 0.296 mmol), X-Phos (14.11 mg, 0.030 mmol), cesium carbonate (289 mg, 0.888 mmol), and Pd2(dba)3 (13.55 mg, 0.015 mmol) were placed in a flask flushed with Ar. Degassed Dioxane (1.2 ml) and Water (0.12 ml) were added and heated to 110° C. for 5.5 h. The reaction was allowed to cool to room temperature and then quenched with saturated aqueous sodium bicarbonate and extracted with EtOAc (3×). The combined organics were dried over Na2SO4, filtered and concentrated in vacuo. Purification via silica gel column chromatography (10-30% EtOAc:hexanes) afforded 2-[5-(3-amino-5-methylphenyl)-1,3-thiazol-2-yl]-1-{[tert-butyl(dimethyl)silyl]oxy}propan-2-ol (82 mg, 73%) as a brown oil. MS ESI: [M+H]+ m/z 379.

Workup

  1. customflushed with Ar
  2. additionDegassed Dioxane (1.2 ml) and Water (0.12 ml) were added
  3. temperatureto cool to room temperature
  4. customquenched with saturated aqueous sodium bicarbonate
  5. extractionextracted with EtOAc (3×)
  6. dry with materialThe combined organics were dried over Na2SO4
  7. filtrationfiltered
  8. concentrationconcentrated in vacuo
  9. customPurification via silica gel column chromatography (10-30% EtOAc:hexanes)

Sources & evidence

ORD record
ord-dbad685cc86c44c297ddd19f3b4a0c83
Source dataset
uspto-grants-2013_10
Patent number
US08551984B2

Reaction notes

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