Methanol → 2-(5-Bromo-1,3-thiazol-2-yl)propan-2-ol

HRID 410589Notes

Reaction equation

HRID 410589 reaction equation
[S:1]1[CH:5]=[CH:4][N:3]=[C:2]1[C:6]([OH:9])([CH3:8])[CH3:7].C([O-])(O)=O.[Na+].[Br:15]Br.CO>C(Cl)(Cl)Cl.[O-]S([O-])(=S)=O.[Na+].[Na+]>[Br:15][C:5]1[S:1][C:2]([C:6]([OH:9])([CH3:8])[CH3:7])=[N:3][CH:4]=1

Participants

7

Reactant 4

HCID 887MethanolHCID 24408Bromine2×HCID 516892Sodium Bicarbonate3×HCID 129928072-Thiazol-2-yl-propan-2-ol

Product 1

HCID 227143062-(5-Bromo-1,3-thiazol-2-yl)propan-2-olYield 67.5%

Reagents, catalysts & solvents 2

HCID 6212ChloroformSolventHCID 24477Sodium ThiosulfateSolvent

Procedure

The product of Step 1 (8.97 g, 62.6 mmol) was dissolved in CHCl3 (125 mL), and NaHCO3 (5.79 g, 68.9 mmol) was added. Bromine (15.01 g, 94 mmol) was then added dropwise. After stirring for 2 h at room temperature, LC/MS showed a mixture of starting material and product (50% conversion). Additional NaHCO3 (2.89 g, 34.5 mmol), bromine (7.51 g, 47.0 mmol), and methanol (15 mL) were added, and the reaction was stirred for another 2 h at room temperature. The reaction was diluted with 10% Na2S2O3, neutralized with saturated NaHCO3, and extracted with dichloromethane (2×). The combined organic layers were dried (MgSO4), filtered and evaporated. Flash chromatography (0-15% ethyl acetate in toluene) afforded 9.38 g (67%) of 2-(5-bromo-1,3-thiazol-2-yl)propan-2-ol as a white solid. ESI: [M+H]+ m/z 221.9/223.9.

Workup

  1. additiona mixture of starting material and product (50% conversion)
  2. stirringthe reaction was stirred for another 2 h at room temperature
  3. extractionextracted with dichloromethane (2×)
  4. dry with materialThe combined organic layers were dried (MgSO4)
  5. filtrationfiltered
  6. customevaporated

Sources & evidence

ORD record
ord-a6fede38e3774e27b48a2f6b10857b02
Source dataset
uspto-grants-2014_06
Patent number
US08759366B2

Reaction notes

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