Diisopropylethylamine → benzyl 2-((1R,2S)-2-((R)-5-((3,5-difluoro-4-(trimethylsilyl)phenyl)carbamoyl)-2-methoxy-5, 6,7,8-tetrahydro-1,6-naphthyridine-6-carbonyl)cyclopropyl)acetate

Participants

Reaction Steps

HATU (137 mg, 0.36 mmol) was added to a solution of (R)—N-(3,5-difluoro-4-(trimethylsilyl)phenyl)-2-methoxy-5,6,7,8-tetrahydro-1,6-naphthyridine-5-carboxamide (128 mg, 0.33 mmol), trans-2-(2-(benzyloxy)-2-oxoethyl)cyclopropanecarboxylic acid (84 mg, 0.36 mmol) and DIEA (0.065 mL, 0.36 mmol) in DMF (2 mL) at room temperature, and the mixture was stirred at room temperature for 2 hr. To the reaction mixture was added water, and the mixture was extracted with ethyl acetate. The organic layer was washed with water, and dried over magnesium sulfate, and the solvent was evaporated under reduced pressure. The obtained residue was purified by silica gel column chromatography (solvent gradient; 30→80% ethyl acetate/hexane) to give benzyl 2-((1R,2S)-2-((R)-5-((3,5-difluoro-4-(trimethylsilyl)phenyl)carbamoyl)-2-methoxy-5,6,7,8-tetrahydro-1,6-naphthyridine-6-carbonyl)cyclopropyl)acetate (46 mg, 0.076 mmol, 23%) as a less polar compound, and benzyl 2-((1S,2R)-2-((R)-5-((3,5-difluoro-4-(trimethylsilyl)phenyl)carbamoyl)-2-methoxy-5,6,7,8-tetrahydro-1,6-naphthyridine-6-carbonyl)cyclopropyl)acetate (39 mg, 0.064 mmol, 20%) as a more polar compound, respectively.

Provenance & Evidence