3-Methyl-5-isoxazolecarboxylic acid → (R)-Methyl 3-(5-methyl isoxazole-3-carboxamido)-2,3-dihydro-1H-indene-5-carboxylate

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Reaction Steps

HATU (4.4 g, 11.7 mmol, 1.5 eq) and DIPEA (3.0 ml, 15.6 mmol, 2 eq) were added to an ice-cooled solution of 5-methylisoxazole-3-carboxylic acid (990 mg, 7.8 mmol, 1 eq) in dichloromethane (80 ml), and stirring was carried out for 30 min. (R)-Methyl 3-amino-2,3-dihydro-1H-indene-5-carboxylate (A-07) (7.8 mmol, 1 eq) was dissolved in dichloromethane (20 ml) and added dropwise to the reaction solution, and stirring was carried out for 16 h at RT. The reaction solution was diluted with dichloromethane (250 ml), washed with sat. sodium hydrogen carbonate solution (50 ml), sat. ammonium chloride solution (50 ml), water (50 ml) and sat. NaCl solution (50 ml), dried over sodium sulfate and concentrated under reduced pressure. After purification by column chromatography (silica gel, 2% MeOH in dichloro-methane), the desired product was obtained in the form of a yellowish solid. Yield: 68% (1.6 g, 5.3 mmol).

Provenance & Evidence