Formaldehyde → (2S)-2-(4-(N-methyl-N-((3R)-tetrahydrofuran-3-yl)amino)phenyl)-4-((1R)-1-phenylethyl)morpholine

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Reaction Steps

Sodium triacetoxyborohydride (2.4 g, 11.3 mmol) was added to a solution of 4-((1R)-1-phenylethyl)-(2S)-2-(4-(N-((3R)-tetrahydrofuran-3yl)amino)phenyl)morpholine (1.3 g, 3.69 mmol) and formalin (35%, 1.6 g, 18.6 mmol) in dichloroethane (50 mL) at room temperature. After stirring for 2 hours, the resulting suspension was partitioned between ethyl acetate and 1 N sodium hydroxide. The aqueous layer was extracted with ethyl acetate. The combined organic layer was washed with brine, dried over magnesium sulfate, and concentrated in vacuo. The residue was purified by silica gel chromatography eluting 5-10% methanol in chloroform to furnish (2S)-2-(4-(N-methyl-N-((3R)-tetrahydrofuran-3-yl)amino)phenyl)-4-((1R)-1-phenylethyl)morpholine (1.35 g, 100%) as a pale yellow oil.

Provenance & Evidence