Diisopropylethylamine → HCID 9958698, compound

Participants

Reaction Steps

1H-indole-6-carbaldehyde (238 mg, 1.64 mmol, 1.36 equiv) [Moyer, Mikel P.; Shiurba, John F.; Rapoport, Henry; J. Org. Chem.; 1986, 51, 5106-5110] was added to the solution of the 2-[5-(3,4-dimethoxy-phenyl)-pyrimidin-2-ylsulfanyl]-N-piperidin-3-ylmethyl-acetamide 1h (TFA)n (1.20 mmol, obtained from step 6) and diisopropylethylamine (0.85 mL, 4.8 mmol, 4 equiv) in 50 mL dichloroethane. Sodium triacetoxyborohydride (0.47 g, 2.24 mmol, 1.8 equiv) was added to the solution and the resulting suspension was stirred vigorously overnight. Methanol (5 mL) was added to quench the reaction. The mixture was concentrated and the residue was diluted with ethyl acetate. The solution was poured into saturated NaHCO3 solution (40 mL) and extracted with EtOAc. The combined organic phases were washed with brine, dried (Na2SO4), and concentrated. Chromatography on silica gel (10% methanol in chloroform) afforded 2-[5-(3,4-dimethoxy-phenyl)-pyrimidin-2-ylsulfanyl]-N-[1-(1H-indol-6-ylmethyl)-piperidin-3-ylmethyl]-acetamide (free base, 410 mg, 64%) as a light tan solid.

Provenance & Evidence