Hydrochloric Acid → (3,5-Dibromo-4-hydroxy-phenyl)-[7-(4-trifluoromethyl-phenyl)-2,3-dihydro-pyrido[2,3-b][1,4]oxazin-1-yl]-methanone

HRID 1943691Notes

Reaction equation

HRID 1943691 reaction equation
[Br:1][C:2]1[CH:3]=[C:4]([C:11]([N:13]2[CH2:18][CH2:17][O:16][C:15]3[N:19]=[CH:20][C:21]([C:23]4[CH:28]=[CH:27][C:26]([C:29]([F:32])([F:31])[F:30])=[CH:25][CH:24]=4)=[CH:22][C:14]2=3)=[O:12])[CH:5]=[C:6]([Br:10])[C:7]=1[O:8]C.[Br-].[Li+].N1CCNCC1.Cl>CN(C)C=O.O>[Br:10][C:6]1[CH:5]=[C:4]([C:11]([N:13]2[CH2:18][CH2:17][O:16][C:15]3[N:19]=[CH:20][C:21]([C:23]4[CH:24]=[CH:25][C:26]([C:29]([F:30])([F:32])[F:31])=[CH:27][CH:28]=4)=[CH:22][C:14]2=3)=[O:12])[CH:3]=[C:2]([Br:1])[C:7]=1[OH:8]

Participants

7

Reactant 4

HCID 313Hydrochloric AcidHCID 4837PiperazineHCID 82050Lithium BromideHCID 66936629(3,5-Dibromo-4-methoxy-phenyl)-[7-(4-trifluoromethyl-phenyl)-2,3-dihydro-pyrido[2,3-b][1,4]oxazin-1-yl]-methanone

Product 1

HCID 66936574(3,5-Dibromo-4-hydroxy-phenyl)-[7-(4-trifluoromethyl-phenyl)-2,3-dihydro-pyrido[2,3-b][1,4]oxazin-1-yl]-methanoneYield 50.3%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6228DimethylformamideSolvent

Procedure

In a 10 ml flask, (3,5-dibromo-4-methoxy-phenyl)-[7-(4-trifluoromethyl-phenyl)-2,3-dihydro-pyrido[2,3-b][1,4]oxazin-1-yl]-methanone (122 mg, 0.21 mmol), lithium bromide (148 mg, 1.71 mmol) and piperazine (28 mg, 0.32 mmol) were dissolved in 3 ml of N,N-dimethyl formamide and then stirred at 1000 for 2 hours. After completion of the reaction by adding water dropwise, the mixture was adjusted to weak acidic condition (pH=6) by using 1N hydrochloric acid. The formed solid was filtered and washed with distilled water. The resulting solid was recrystallized from tetrahydrofuran and methanol to obtain the target compound 45, i.e., (3,5-dibromo-4-hydroxy-phenyl)-[7-(4-trifluoromethyl-phenyl)-2,3-dihydro-pyrido[2,3-b][1,4]oxazin-1-yl]-methanone (59 mg, 50%).

Workup

  1. customAfter completion of the reaction
  2. filtrationThe formed solid was filtered
  3. washwashed with distilled water
  4. customThe resulting solid was recrystallized from tetrahydrofuran and methanol

Sources & evidence

ORD record
ord-57d1b24c5b3a4b5f9f448668a854596f
Source dataset
uspto-grants-2013_03
Patent number
US08394792B2

Reaction notes

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