Triphenylphosphine → cis-3-[(4-propoxy-1H-indazol-5-yl)oxy]cyclohexanamine

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Reaction Steps

Under a nitrogen atmosphere, triphenylphosphine (164 mg, 0.624 mmol), the trans-2-(3-hydroxycyclohexyl)-1H-isoindole-1,3(2H)-dione (128 mg, 0.520 mmol) obtained in Example 385, (b) and diisopropyl azodicarboxylate (113 μl, 0.572 mmol) were added at 0° C. to a solution of the 4-propoxy-1H-indazol-5-ol (100 mg, 0.520 mmol) obtained in Example 634 in tetrahydrofuran (4 ml). After 30 minutes, the resulting mixture was heated to room temperature and stirred overnight. The reaction solution was concentrated under reduced pressure, and the resulting residue was diluted with chloroform and washed with a 1M-aqueous sodium hydroxide solution. The aqueous layer was re-extracted with chloroform and then the organic layer was dried over anhydrous magnesium sulfate. The organic layer dried was concentrated under reduced pressure and the resulting residue was purified by a silica gel column chromatography (eluent: hexane/ethyl acetate). To the oil thus obtained was added a 30%-methylamine-ethanol solution at room temperature, and the resulting mixture was refluxed. After 2 hours, the mixture was concentrated under reduced pressure at room temperature, and the resulting residue was purified by a silica gel column chromatography (eluent: chloroform/methanol→chloroform/methanol (1%-aqueous ammonia)) to obtain cis-3-[(4-propoxy-1H-indazol-5-yl)oxy]cyclohexanamine (82.3 mg, 55%).

Provenance & Evidence