Phosgene → 5-Bromothiazol-2-yl Isocyanate

HRID 1111584Notes

Reaction equation

HRID 1111584 reaction equation
[NH2:1][C:2]1[S:3][C:4]([Br:7])=[CH:5][N:6]=1.[C:8](Cl)(Cl)=[O:9]>C(OCC)(=O)C>[Br:7][C:4]1[S:3][C:2]([N:1]=[C:8]=[O:9])=[N:6][CH:5]=1

Participants

4

Reactant 2

HCID 6371PhosgeneHCID 436002-Thiazolamine, 5-bromo-

Product 1

HCID 230622645-Bromothiazol-2-yl Isocyanate

Reagents, catalysts & solvents 1

HCID 8857Ethyl AcetateSolvent

Procedure

2-Amino-5-bromothiazole (19.0 grams) and a saturated solution of phosgene in ethyl acetate (200 ml) were charged into a glass reaction vessel equipped with a mechanical stirrer, thermometer and reflux condenser. The reaction mixture was heated at reflux with stirring for a period of about 3 hours. After this time the reaction mixture was cooled and filtered to recover the desired product 5-bromothiazol-2-yl isocyanate dimer as a fine yellow powder.

Workup

  1. customequipped with a mechanical stirrer
  2. temperaturethermometer and reflux condenser
  3. temperatureThe reaction mixture was heated
  4. temperatureat reflux
  5. temperatureAfter this time the reaction mixture was cooled
  6. filtrationfiltered
  7. customto recover the desired product 5-bromothiazol-2-yl isocyanate dimer as a fine yellow powder

Sources & evidence

ORD record
ord-86977c1649e6431e9deae02fed40496b
Source dataset
uspto-grants-1978_10
Patent number
US04118390

Reaction notes

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