[CH:1]1([CH:6]([NH:14][C:15](=O)OC)[C:7]([N:9]2[CH2:12][CH:11]([OH:13])[CH2:10]2)=O)[CH2:5][CH2:4][CH2:3][CH2:2]1.[H-].[H-].[H-].[H-].[Li+].[Al+3]>C1COCC1.CCOCC>[CH:1]1([CH:6]([NH:14][CH3:15])[CH2:7][N:9]2[CH2:12][CH:11]([OH:13])[CH2:10]2)[CH2:5][CH2:4][CH2:3][CH2:2]1To a solution of methyl 1-cyclopentyl-2-(3-hydroxyazetidin-1-yl)-2-oxoethylcarbamate (Compound K2.1) (1.89 g, 7.37 mmol) in THF (50 mL) was a 1M solution of LAH in THF (30 mL, 30.0 mmol) dropwise added (over approximately 5 min) at rt under a nitrogen atmosphere. The resultant mixture was stirred at rt for 30 min and heated at 45° C. over night. Additional LAH in THF (1M solution, 10 mL) was added and the mixture was heated at 65° C. for 1 day. The mixture was diluted with Et2O (150 mL) and the reaction was quenched with Na2SO4×10H2O. The mixture was filtered and a HCl solution in EtOH was added (1.25N, 15 mL) to the filtrate. The filtrate was concentrated under reduced pressure and the residue was co-evaporated with MeOH to give the title compound (1.5 g, 75.0%). The obtained crude product was used without further purification. LCMS (M+H)+: 199.
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