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

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Reaction Steps

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.

Provenance & Evidence