Trifluoroacetic acid → 3-Chloro-4-fluoro-benzo[b]thiophene-2-carboxylic acid (4-amino-cyclohexyl)-(2-methoxy-5-pyridin-3-yl-benzyl)-amide

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Reaction Steps

410 is prepared according to a method similar to Method G. {4-[(3-Chloro-4-fluoro-benzo-[b]thiophene-2-carbonyl)-(2-methoxy-5-pyridin-3-yl-benzyl)-amino]-cyclohexyl}-carbamic acid tert-butyl ester (N3) (0.93 g, 1.48 mmol) is dissolved in 10 mL methylene chloride. Trifluoroacetic acid is added (0.35 mL) and the mixture is stirred at room temperature for 20 minutes. The reaction mixture is evaporated and pumped dry. The residue is partitioned between 5% methanol/methylene chloride and half-saturated aqueous sodium bicarbonate. The aqueous layer is extracted with 5% methanol/methylene chloride, and the combined organic extracts are dried (MgSO4), filtered and evaporated to yield an ivory solid (0.375 g, 0.717 mmol; 48% yield) that was pure by LCMS analysis.

Provenance & Evidence