Triethylamine → (2-Phenyl-piperidin-1-yl)-(5-piperidin-4-yl-thiophen-3-yl)methanone

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Reaction Steps

4-(4-Carboxy-thiophen-2-yl)-piperidine-1-carboxylic acid t-butyl ester (0.1 g, 0.32 mmol) was dissolved in acetonitrile (2 mL). Triethylamine (0.96 mmol), HATU (0.35 mmol) and 2-phenylpiperidine (0.35 mmol) were added and the reaction stirred at room temperature for 5 hours. The mixture was purified by HPLC, eluting with 10%-98% acetonitrile in water (0.1% formic acid) over 30 minutes. The fractions containing the desired product were concentrated under vacuum to give an oil which was dissolved in trifluoroacetic acid (3 mL) and DCM (5 mL) and stirred for 3 hours. The solvent was evaporated and the residue was purified by flash chromatography on an SCX-2 cartridge, washing with acetonitrile, then methanol and then eluting with 2 M ammonia in methanol. The fractions containing the desired product were concentrated under vacuum to give the title compound (0.058 g). LCMS m/z 355.18 [M+H]+ RT=6.59 min (Analytical Method 2). 1H NMR (400 MHz, CHCl3-d): δ 7.4 (m, 2H), 7.25 (m, 4H), 6.9 (s, 1H), 3.2 (d, 2H), 2.9 (m, 2H), 2.7 (m, 2H), 2.6 (m, 3H), 2.4 (d, 1H), 2.1-1.8 (m, 3H), 1.8-1.4 (m, 6H).

Provenance & Evidence