Triphenylphosphine → methyl (S)-2-(4-benzylpiperazin-1-yl)-3-[4-(2-trifluoromethylpyrazolo[1,5-a]pyridin-3-ylmethoxy)-benzoylamino]propanoate

Participants

Reaction Steps

795 mg (3.0 mmol) of triphenylphosphine and 565 mg (2.6 mmol) of (2-trifluoromethylpyrazolo[1,5-a]pyridin-3-yl)methanol are added respectively to a solution of 800 mg (2.0 mmol) of methyl (S)-2-(4-benzylpiperazin-1-yl)-3-(4-hydroxybenzoylamino)propanoate (prepared as described in example 22-5) in 8 ml of tetrahydrofuran. After stirring at ambient temperature for 30 min, 595 μl (3.0 mmol) of diisopropyl azodicarboxylate are added and the medium is stirred for 18 h at ambient temperature. After evaporating to dryness, the crude residue obtained is purified by chromatography over a silica column eluted with 100% ethyl acetate. 590 mg (49%) of methyl (S)-2-(4-benzylpiperazin-1-yl)-3-[4-(2-trifluoromethylpyrazolo[1,5-a]pyridin-3-ylmethoxy)-benzoylamino]propanoate are obtained in the form of a light-yellow solid.

Provenance & Evidence