Benzhydrylpiperazine → 1-[2-(4-Benzhydrylpiperazin-1-yl)-2-oxoethyl]-3-phenylpiperidin-2-one

Participants

Reaction Steps

To 1-benzhydrylpiperazine (0.238 g, 0.943 mmol), the product from Example 91D (0.200 g, 0.857 mmol) and 2-(1H-benzo[d][1,2,3]triazol-1-yl)-1,1,3,3-tetramethylisouronium hexafluorophosphate(V) (0.358 g, 0.943 mmol) in dichloromethane (1.5 mL) was added diisopropylethylamine (0.225 mL, 1.286 mmol), and the reaction mixture was stirred at room temperature. After stirring overnight, the reaction was concentrated and loaded onto a silica gel column (SF25-25, Analogix®, Burlington, Wis.) and eluted using a gradient of 0.5% to 5% methanol/dichloromethane. The product was isolated along with a slightly lower Rf spot. The mixture was rechromatographed over silica gel using a gradient of 5% to 100% ethyl acetate/hexanes to supply the title compound. 1H NMR (300 MHz, CDCl3) δ ppm 7.38-7.43 (m, 4H), 7.14-7.34 (m, 11H), 4.43 (d, J=15.6 Hz, 1H), 4.24 (s, 1H), 4.00 (d, J=15.6 Hz, 1H), 3.70 (dd, J=7.7, 6.0 Hz, 1H), 3.61-3.66 (m, 2H), 3.52-3.59 (m, 1H), 3.44-3.49 (m, 2H), 3.41 (dd, J=11.6, 5.8 Hz, 1H), 2.37-2.43 (m, 4H), 2.15-2.28 (m, 1H), 1.90-2.03 (m, 2H), 1.77-1.89 (m, 1H); MS (ESI+) m/z 468 (M+H)+.

Provenance & Evidence