Water → rel-Phenylmethyl (3R,4R)-4-[[(1,1-dimethylethoxy)carbonyl]amino]-3-methoxy-1-piperidinecarboxylate

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Reaction Steps

benzyl (3S,4S)-4-tert-butoxycarbonylamino-3-hydroxy-piperidine-1-carboxylate (5.00 g) is dissolved in THF (6 mL) and combined with 30 mL aqueous, semiconcentrated NaOH solution, benzyltriethylammonium chloride as well as dimethylsulphate (2.26 mL). After 22 h H2O (200 mL) is added and the mixture is extracted with EtOAc (150 mL). The organic phase is dried on magnesium sulphate, filtered off from the desiccant and the solvent is eliminated in vacuo. Purification is carried out using a silica gel column (cHex/EtOAc 65/35).

Provenance & Evidence