[NH2:1][CH2:2][C:3]([CH3:6])([OH:5])[CH3:4].[O:7]1[CH2:12][CH2:11][C:10](=O)[CH2:9][CH2:8]1.C([BH3-])#N.[Na+].C([O-])(O)=O.[Na+]>CO.C(O)(=O)C>[CH3:4][C:3]([OH:5])([CH3:6])[CH2:2][NH:1][CH:10]1[CH2:11][CH2:12][O:7][CH2:8][CH2:9]1
2.75 g of 1-amino-2-methylpropan-2-ol are dissolved in 20 ml of MeOH. 1.71 ml of glacial acetic acid are added dropwise under an inert atmosphere. 2 g of tetrahydropyran-4-one in 10 ml of MeOH are added, the mixture is stirred for 30 minutes at room temperature and 1.98 g of sodium cyanoborohydride are added. The resulting mixture is stirred under an inert atmosphere for 15 hours. The reaction medium is poured into saturated aqueous NaHCO3 solution (100 ml). The resulting mixture is stirred for 30 minutes and then extracted with 4 times 100 ml of DCM. The organic phase is dried over Na2SO4, filtered and evaporated without heating. The MeOH contained in the aqueous phase is evaporated off and the extraction, drying, filtration and evaporation operation is repeated 3 times. 2.8 g of 2-methyl-1-((tetrahydro-2H-pyran-4-yl)amino)propan-2-ol are recovered in total.
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