Boron tribromide → 6-[2-(2-Chloro-5-hydroxy-phenyl)-1-hydroxy-1-trifluoromethyl-propyl]-4-methyl-4H-benzo[1,4]oxazin-3-one

HRID 2096715Notes

Reaction equation

HRID 2096715 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([O:8]C)=[CH:4][C:3]=1[CH:10]([CH3:29])[C:11]([C:17]1[CH:18]=[CH:19][C:20]2[O:25][CH2:24][C:23](=[O:26])[N:22]([CH3:27])[C:21]=2[CH:28]=1)([OH:16])[C:12]([F:15])([F:14])[F:13].B(Br)(Br)Br.C([O-])(O)=O.[Na+]>ClCCl>[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([OH:8])=[CH:4][C:3]=1[CH:10]([CH3:29])[C:11]([C:17]1[CH:18]=[CH:19][C:20]2[O:25][CH2:24][C:23](=[O:26])[N:22]([CH3:27])[C:21]=2[CH:28]=1)([OH:16])[C:12]([F:13])([F:14])[F:15]

Participants

5

Reactant 3

HCID 25134Boron tribromideHCID 516892Sodium BicarbonateHCID 666971746-[2-(2-Chloro-5-methoxy-phenyl)-1-hydroxy-1-trifluoromethyl-propyl]-4-methyl-4H-benzo[1,4]oxazin-3-one

Product 1

HCID 666971956-[2-(2-Chloro-5-hydroxy-phenyl)-1-hydroxy-1-trifluoromethyl-propyl]-4-methyl-4H-benzo[1,4]oxazin-3-oneYield 101.3%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Conditions

Temperature
0 °C

Procedure

A solution of 6-[2-(2-chloro-5-methoxy-phenyl)-1-hydroxy-1-trifluoromethyl-propyl]-4-methyl-4H-benzo[1,4]oxazin-3-one (553 mg) in dichloromethane (13 ml) was cooled to −70° C. A 1 M solution of boron tribromide in dichloromethane (5.14 ml) was added and the mixture was stirred at −70° C. for 1.5 h and at 0° C. for 1 h. A mixture of ice water and saturated aqueous NaHCO3 solution was added and the mixture was extracted with dichloromethane. The organic phase was washed with water and dried (MgSO4). The product was purified by chromatography (SiO2, cyclohexane/EtOAc 9:1=>2:3) to give the title compound (542 mg) as off-white foam. MS (m/e, ISP neg. ion)=414.0 [M−H+].

Workup

  1. additionwas added
  2. extractionthe mixture was extracted with dichloromethane
  3. washThe organic phase was washed with water
  4. dry with materialdried (MgSO4)
  5. customThe product was purified by chromatography (SiO2, cyclohexane/EtOAc 9:1=>2:3)

Sources & evidence

ORD record
ord-08ea8dff3e884166ad3e6fd11c7e41b2
Source dataset
uspto-grants-2013_05
Patent number
US08450313B2

Reaction notes

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