Acetaldehyde → 1-Benzyl-4-[N-ethyl-N-(3-(ethylamino)-2-pyridinyl)amino]piperidine

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Reaction Steps

1-Benzyl-4-[N-ethyl-N-(3-(amino)-2-pyridinyl)amino]piperidine (EXAMPLE 204 Part B, 1.0 g, 3.22 mmol) is dissolved in methanol (8 ml) and cooled to 0°. The acetaldehyde (0.20 ml, 3.54 mmol) and sodium cyanoborohydride (0.31 g, 3.54 mmol) are added and the reaction is slowly warmed to 20°-25° and stirred for 18 hr. Then a further sodium cyanoborohydride (2 eq.) and 1.6 eq. of acetaldehyde are added and the reaction is stirred a further 20 hr. Then it is diluted with ethyl acetate and poured into water, washed with saline, dried over anhydrous sodium sulfate and concentrated under reduced pressure. Purification by flash column chromatography (silica gel; methanol/methylene chloride (2.5/97.5)), gives the title compound, NMR (300 MHz, CDCl3) 7.65, 7.40-7.17, 6.83, 6.71, 4.63, 3.42, 3.10-3.00, 2.93, 2.81, 1.92, 1.72-1.51, 1.17 and 079δ.

Provenance & Evidence