“…19.2, 28.7, 29.0, 32.0, 33.1, 40.5, 58.6, 61.9, 125.9, 126.3, 127.5, 128.3, 128.5, 128.6, 131.3, 131.4, 137.1 N-Methyl-2,6-cis-diphenethyl-1,2,3,6-tetrahydro-pyridine (17)-Compound 15 (colorless crystals recrystallized from benzene, mp 167-168 °C) was synthesized from the condensation reaction of 2,6-lutidine with benzaldehyde utilizing the reported procedure. 32 The double bonds of the 2,6-side chains of compound 15 were then reduced by Pd-C catalytic hydrogenation, and the resulting product was treated with methyl ptoluenesulfonate following the reported procedure, 32 to afford the N-methylated compound 16 (yellow crystals recrystallized from methanol, mp 238-239 °C). NaBH 4 (160 mg, 4.22 mmol) was added to a suspension of compound 16(2.00 g, 4.22 mmol) in absolute ethanol (100 mL) at 0 °C.…”