2-Bromopropiophenone → 2-Amino-4-phenyl-5-methylthiazole

HRID 1843793Notes

Reaction equation

HRID 1843793 reaction equation
Br[CH:2]([CH3:11])[C:3]([C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1)=O.[NH2:12][C:13]([NH2:15])=[S:14]>CCO>[CH3:11][C:2]1[S:14][C:13]([NH2:15])=[N:12][C:3]=1[C:5]1[CH:10]=[CH:9][CH:8]=[CH:7][CH:6]=1

Participants

4

Reactant 2

HCID 164522-BromopropiophenoneHCID 2723790Thiourea

Product 1

HCID 961292-Amino-4-phenyl-5-methylthiazoleYield 109.7%

Reagents, catalysts & solvents 1

HCID 702EthanolSolvent

Procedure

A mixture of 2-bromo-1-phenylpropan-1-one (3.00 g, 19.5 mmol) and thiourea (1.56 g, 20.5 mmol) in 95% EtOH (30 mL) was heated at reflux for 60 min. The solution was concentrated and mixed with water (100 mL) and saturated aqueous Na2CO3 (5.0 mL). The resultant precipitate was filtered and recrystallized in toluene. The solids were filtered and dried under vacuum to give 5-methyl-4-phenylthiazol-2-amine (4.07 g) as yellow solids in 77% yield: 1H NMR (500 MHz, DMSO-d6) δ 8.85 (s, 2 H), 7.54-7.49 (m, 5 H), 2.28 (s, 3 H).

Workup

  1. temperaturewas heated
  2. temperatureat reflux for 60 min
  3. concentrationThe solution was concentrated
  4. additionmixed with water (100 mL) and saturated aqueous Na2CO3 (5.0 mL)
  5. filtrationThe resultant precipitate was filtered
  6. customrecrystallized in toluene
  7. filtrationThe solids were filtered
  8. customdried under vacuum

Sources & evidence

ORD record
ord-1201694fe4c0421ba870a5cd39db0bd4
Source dataset
uspto-grants-2015_02
Patent number
US08946268B2

Reaction notes

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