Acetone → (2R*,4S*)-2-Benzyl-1-(2-naphthoyl)-N-(4-quinolylmethyl)-4-piperidinamine

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反応手順

28 mg (0.73 mmol) of sodium borohydride are added in three portions over the course of 20 minutes to a solution of 106 mg (0.182 mmol) of (2R*,4S*)-2-benzyl-1-(2-naphthoyl)-N-(4-quinolylmethyl)-N-trifluoroacetyl-4-piperidinamine in 1.5 ml of methanol at 0°, and the mixture is subsequently stirred at 0° for 3 hours. 0.06 ml (0.81 mmol) of acetone is then added to the reaction mixture, and the stirring is completed for 10 minutes. The methanol is removed in a rotary evaporator, and the solid white residue is partitioned between ethyl acetate and water. The organic phases are washed with brine, dried over magnesium sulfate and evaporated to dryness. The resulting white foam is chromatographed with methylene chloride/methanol/conc. ammonia (1500:50:1) on silica gel. The title compound of the formula ##STR28## as white foam is obtained as white foam. TLC: methylene chloride/methanol/conc. ammonia (700:50:1) Rf =0.34, FD-MS: M+ =485.

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