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0 °C

Methyl 3-methyl-4-((R)-1-phenylethylimino)-tetrahydro-2H-pyran-3-carboxylate (crude, 13.53 mmol) in acetonitrile-acetic acid (1:1, 80 mL) was treated with NaBH(OAc)3 and stirred for 2.5 h at 0° C. Following concentration in vacuo, the residue was dissolved in ethyl acetate (200 mL), washed with saturated NaHCO3 until the aqueous phase was basic, dried over MgSO4, and purified by chromatography with 20% ethyl acetate/hexane to yield 1.37 g (37% in 2 steps) of (4R)-methyl 3-methyl-4-((R)-1-phenylethylamino)-tetrahydro-2H-pyran-3-carboxylate. MS: (M+H)+=278.1.

1. concentrationconcentration in vacuo
2. dissolutionthe residue was dissolved in ethyl acetate (200 mL)
3. washwashed with saturated NaHCO3 until the aqueous phase
4. dry with materialdried over MgSO4
5. custompurified by chromatography with 20% ethyl acetate/hexane