Methyl morpholine oxide → 3-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-4,5-dihydro-2H-benzo[g] indazole-7-carbaldehyde

HRID 1506365Notes

Reaction equation

HRID 1506365 reaction equation
[C:1]1([C:7]2[C:11]([C:12]([F:15])([F:14])[F:13])=[C:10]([C:16]3[NH:17][N:18]=[C:19]4[C:24]=3[CH2:23][CH2:22][C:21]3[CH:25]=[C:26]([CH:29]=C)[CH:27]=[CH:28][C:20]4=3)[O:9][N:8]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.C[N+]1([O-])CC[O:35]CC1.I([O-])(=O)(=O)=O.[Na+]>C1COCC1.O.[Os](=O)(=O)(=O)=O>[C:1]1([C:7]2[C:11]([C:12]([F:13])([F:14])[F:15])=[C:10]([C:16]3[NH:17][N:18]=[C:19]4[C:24]=3[CH2:23][CH2:22][C:21]3[CH:25]=[C:26]([CH:29]=[O:35])[CH:27]=[CH:28][C:20]4=3)[O:9][N:8]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1

Participants

7

Reactant 3

HCID 82029Methyl morpholine oxideHCID 23667635Sodium periodateHCID 671678673-phenyl-4-(trifluoromethyl)-5-(7-vinyl-4,5-dihydro-2H-benzo[g] indazol-3-yl)isoxazole

Product 1

HCID 866698853-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-4,5-dihydro-2H-benzo[g] indazole-7-carbaldehydeYield 109%

Reagents, catalysts & solvents 3

HCID 30318Osmium TetroxideCatalystHCID 962WaterSolventHCID 8028TetrahydrofuranSolvent

Procedure

To 3-phenyl-4-(trifluoromethyl)-5-(7-vinyl-4,5-dihydro-2H-benzo[g]indazol-3-yl)isoxazole (Preparation 22B, 0.15 g, 0.368 mmol) in THF (2 mL) were added sequentially N-methylmorpholine N-oxide (50% aq., 0.17 mL, 0.368 mmol) and osmium tetroxide (4% aq. 0.058 mL, 7.36 μmol) at room temperature under a nitrogen atmosphere. The reaction was stirred at room temperature for 45 min. and sodium periodate (0.118 g, 0.552 mmol) in water (1 mL) was added over a period of 1 min. at room temperature. The milky heterogeneous reaction mixture was stirred at room temperature for 45 min., concentrated, and partitioned between ethyl acetate (20 mL) and water (10 mL). The ethyl acetate layer was dried over sodium sulfate and concentrated to yield 3-(3-phenyl-4-(trifluoromethyl)isoxazol-5-yl)-4,5-dihydro-2H-benzo[g]indazole-7-carbaldehyde (0.164 g, 0.401 mmol, quantitative yield) as a dark brown oil. LC/MS M+1=410.1.

Workup

  1. stirringThe milky heterogeneous reaction mixture was stirred at room temperature for 45 min.
  2. concentrationconcentrated
  3. custompartitioned between ethyl acetate (20 mL) and water (10 mL)
  4. dry with materialThe ethyl acetate layer was dried over sodium sulfate
  5. concentrationconcentrated

Sources & evidence

ORD record
ord-e4d0f40dece44a8c9720197ca6c95aa3
Source dataset
uspto-grants-2015_12
Patent number
US09216972B2

Reaction notes

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