Sodium hydride → 4-[(4-But-2-ynyloxy-benzenesulfonyl)-methyl-amino]-3-methyl-isoxazolo[5,4-b]pyridine-5-carboxylic acid ethyl ester

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Reaction Steps

To a suspension of 0.105 g (0.63 mmol) of 60% sodium hydride in 8 mL of 1-methyl-2-pyrrolidinone was added 0.628 g (2.63 mmol) of the product of Example 5 and the resulting mixture was stirred for 30 minutes at room temperature. A solution of 0.601 g (2.50 mmol) of ethyl-4-chloro-3-methylisoxazolo[5,4-b]pyridine-5-carboxylate in 7 mL of 1-methyl-2-pyrrolidinone was added and the reaction was heated to 80-90° C. for 48 h. The reaction mixture was then concentrated in vacuo and the residue was diluted with dichloromethane. The organics were washed with water, 2N citric acid solution and brine, dried over Na2SO4, filtered through Magnesol® and concentrated in vacuo. The residue was triturated with ethyl acetate/hexanes and the resulting solid was filtered and dried in vacuo to provide 1.0 g (90%) of the product as a solid; m.p.85-90° C. Electrospray Mass Spec: 444 (M+H)+.

Provenance & Evidence