Acetic Anhydride → 2-Acetamido-5-bromo-1,3-thiazole

HRID 2426304Notes

Reaction equation

HRID 2426304 reaction equation
C(O[C:5](=[O:7])[CH3:6])(=O)C.Br.[NH2:9][C:10]1[S:11][C:12]([Br:15])=[CH:13][N:14]=1.C(N(CC)CC)C.[OH-].[Na+]>ClCCl.O>[Br:15][C:12]1[S:11][C:10]([NH:9][C:5](=[O:7])[CH3:6])=[N:14][CH:13]=1

Participants

7

Reactant 4

HCID 7918Acetic AnhydrideHCID 8471TriethylamineHCID 14798Sodium HydroxideHCID 27238485-Bromothiazol-2-amine monohydrobromide

Product 1

HCID 3502602-Acetamido-5-bromo-1,3-thiazole

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6344DichloromethaneSolvent

Conditions

Temperature
0 °C

Procedure

5.9 ml (42.3 mmol) of acetic anhydride are added to a solution of 10 g (38.5 mmol) of 2-amino-5-bromothiazole hydrobromide in 100 ml of dichloromethane and 11 ml (77 mmol) of triethylamine, cooled to 0° C. The reaction medium is stirred for 30 minutes at 0° C. and then for 18 hours at room temperature. After addition of water, the pH is adjusted to pH 8 with aqueous 1M sodium hydroxide solution and the reaction medium is extracted with dichloromethane. The dichloromethane phase is dried over magnesium sulfate, filtered and evaporated. The residue obtained is used in step b without purification.

Workup

  1. waitfor 18 hours at room temperature
  2. extractionthe reaction medium is extracted with dichloromethane
  3. dry with materialThe dichloromethane phase is dried over magnesium sulfate
  4. filtrationfiltered
  5. customevaporated
  6. customThe residue obtained
  7. customis used in step b without purification

Sources & evidence

ORD record
ord-38ce52d7eb41493c82b797f8cad7e138
Source dataset
uspto-grants-2011_06
Patent number
US07968560B2

Reaction notes

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