Reaction equation
[CH3:1][C:2]1[N:3]=[C:4]([C:12]2[CH:17]=[CH:16][C:15]([C:18]([F:21])([F:20])[F:19])=[CH:14][CH:13]=2)[S:5][C:6]=1[C:7]([O:9][CH2:10][CH3:11])=[O:8].[Br:22]N1C(=O)CCC1=O.C(OOC(=O)C1C=CC=CC=1)(=O)C1C=CC=CC=1>C(Cl)(Cl)(Cl)Cl>[Br:22][CH2:1][C:2]1[N:3]=[C:4]([C:12]2[CH:17]=[CH:16][C:15]([C:18]([F:21])([F:20])[F:19])=[CH:14][CH:13]=2)[S:5][C:6]=1[C:7]([O:9][CH2:10][CH3:11])=[O:8]Participants
Reactant 3
Product 1
Reagents, catalysts & solvents 1
Procedure
To a 2-L round-bottom flask equipped with an mechanical overhead stirrer, a reflux condenser and a N2inlet was added ethyl 4-methyl-2-[4-(trifluoromethyl)phenyl]-1,3-thiazole-5-carboxylate (85g, 0.27moles, 1.0eq) and dry carbon tetrachloride (750ml, 0.38M). Freshly recrystallized N-bromo succinimide (52.72g, 1.1eq) was added as a solid, Benzoyl peroxide (6.5g, 10mol %) was added at room temperature all at once as a solid, and the reaction mixture was refluxed for 5hrs. The reaction was monitored by 1H NMR and was determined to be composed of a 9:1mixture of mono-bromination product (i.e. desired product) and di-bromination product with a 90% conversion. After cooling to 0° C. (to precipitate out the succinimide) the reaction was filtered through Celite and the solvent was removed under reduced pressure to yield a brown oil. The oil was crystallized using hexanes to yield 100g (94%) of an off-white product of 90% purity.
Workup
- customTo a 2-L round-bottom flask equipped with an mechanical overhead stirrer, a reflux condenser
- additionwas added at room temperature all at once as a solid
- temperaturethe reaction mixture was refluxed for 5hrs
Sources & evidence
- ORD record
- ord-70b1c34ed7624076a507fc4978cd36af
- Source dataset
- uspto-grants-2008_11
- Patent number
- US07449468B2
Linked notes
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