(2S)-2-[(tert-butoxycarbonyl)amino]-3-(2-methoxypyridin-4-yl)propanoic acid → tert-butyl {(1S)-2-hydroxy-1-[(2-methoxypyridin-4-yl)methyl]ethyl}carbamate

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Reaction Steps

To a solution of (2S)-2-[(tert-butoxycarbonyl)amino]-3-(2-methoxypyridin-4-yl)propanoic acid (1.3 g, 4.4 mmol) in tetrahydrofuran (5.0 mL) with stirring, 1.0 M borane-THF complex in THF (13 mL) was added dropwise to keep the internal temperature at 0° C. (about 15 min). After addition, the mixture was stirred at rt for 3 h, cooled with an ice-bath, quenched with AcOH:MeOH (1:5, 5 mL), partitioned between saturated aqueous NaHCO3 and DCM, dried over Na2SO4, filtered, and evaporated under reduced pressure to give 0.5 g (40% yield) of the desired product. LC-MS found: 283.0 (M+H)+.

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