Diisopropylethylamine → N-{(1S,2R)-1-(3,5-difluorobenzyl)-3-[(3-ethylbenzyl)amino]-2-hydroxypropyl}-5-[(methylsulfonyl)methyl]thiophene-2-carboxamide

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Reaction Steps

To a solution of acid from step 5 (115 mg, 0.52 mmol) and N,N-diisopropylethylamine (540 μL, 3.12 mmol) in methylene chloride (6.5 mL) was added HBTU (200 mg, 0.52 mmol) and the reaction mixture was stirred for 0.5 h. (2R,3S)-3-amino-4-(3,5-difluorophenyl)-1-[(3-ethylbenzyl)amino]butan-2-ol (211 mg, 0.52 mmol) was added in one portion and the reaction mixture was stirred at room temperature for 18 h. The reaction mixture was diluted with methylene chloride and washed with saturated sodium bicarbonate, and saturated sodium chloride, dried (sodium sulfate), filtered, and concentrated under reduced pressure. Purification by flash chromatography (silica, 1-5% methanol in chloroform) gave the title compound (45 mg): mp 128-131° C.; ESI MS m/z 537 [M+H]+.

Provenance & Evidence