Sodium hydride → (S)-1-(tetrahydro-pyran-4-yl)-pyrrolidine-2-carboxylic acid (3-[1,1-dimethyl-2-(tetrahydro-pyran-2-yloxy)-ethyl]-isoxazol-5-yl)-amide

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Reaction Steps

To 1.20 g (6.02 mmol) of (S)-1-(tetrahydro-pyran-4-yl)-pyrrolidine-2-carboxylic acid in DMF (50 mL) are added 3.67 mL (21.1 mmol) diisopropyl-ethyl-amine and 3.44 g (9.03 mmol) of HATU. The solution is stirred at RT for 1 h. In a second flask to 1.45 g (6.02 mmol) of 3-[1,1-dimethyl-2-(tetrahydro-pyran-2-yloxy)-ethyl]-isoxazol-5-ylamine (intermediate 7a) in DMF (25 mL) are added 602 mg sodium hydride (60% dispersion in oil; 15.1 mmol) under cooling by an ice bath. Then this solution is added to the activated acid and stirring is continued for 48 h. The reaction mixture is purified by HPLC-MS to afford 0.51 g of (S)-1-(tetrahydro-pyran-4-yl)-pyrrolidine-2-carboxylic acid (3-[1,1-dimethyl-2-(tetrahydro-pyran-2-yloxy)-ethyl]-isoxazol-5-yl)-amide. Yield: 20%; ESI-MS: 422 [M+H]+; HPLC (Rt): 1.55 min (method C)

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