Triphenylphosphine → 3-(2-(N-t-Butoxycarbonylamino)ethoxy)-5-chloro-1,2-benzisoxazole

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Reaction Steps

To a solution of triphenylphosphine (0.87 g) in tetrahydrofuran (10 ml), was added diethyl azodicarboxylate (0.57 g) dropwise with stirring under ice cooling. The reaction mixture was stirred at the same temperature for 10 minutes. Then, 2-(N-t-butoxycarbonylamino)ethanol (0.48 g) and 5-chloro-3-hydroxy-1,2-benzisoxazole (0.51 g) were added to the reaction mixture successively and stirred under ice cooling for 10 minutes and at room temperature for 24 hours. The solvent was evaporated under reduced pressure and the residue was purified by silica gel column chromatography with cyclohexane/ethyl acetate (4/1) as an eluent. The title compound (0.70 g) was obtained as colorless crystals by crystallization from isopropylether.

Provenance & Evidence