[C:1]([C:3]1[CH:8]=[CH:7][C:6]([C:9](=[O:24])[C:10]([N:13]2[CH2:18][CH2:17][CH2:16][C@H:15]([C:19]([O:21][CH2:22][CH3:23])=[O:20])[CH2:14]2)([CH3:12])[CH3:11])=[CH:5][CH:4]=1)#[N:2].[BH4-].[Na+].Cl.[NH2:28][OH:29].C(=O)(O)[O-].[Na+]>CO.CC(O)C.C(OCC)(=O)C>[OH:24][CH:9]([C:6]1[CH:7]=[CH:8][C:3](/[C:1](=[N:28]/[OH:29])/[NH2:2])=[CH:4][CH:5]=1)[C:10]([N:13]1[CH2:18][CH2:17][CH2:16][C@H:15]([C:19]([O:21][CH2:22][CH3:23])=[O:20])[CH2:14]1)([CH3:12])[CH3:11]To a mixture of (S)-ethyl 1-(1-(4-cyanophenyl)-2-methyl-1-oxopropan-2-yl)piperidine-3-carboxylate (90 mg, 0.274 mmol) in MeOH (5 mL) was added sodium borohydride (15 mg, 0.396 mmol). After 1 hr, the reaction was quenched with water. The reaction mixture was diluted with ethyl acetate and washed with sat NaCl. The organic layer was dried MgSO4, filtered, and concentrated. To a mixture of hydroxylamine hydrochloride (38.1 mg, 0.548 mmol) and sodium bicarbonate (92 mg, 1.096 mmol) in 2-propanol (10 mL) was added the crude product from step one. The reaction mixture was heated at 75° C. overnight. The reaction mixture was diluted with ethyl acetate and washed with H2O. The organic layer was dried MgSO4, filtered, and concentrated to yield 100 mg of (3S)-ethyl 1-(1-hydroxy-1-(4-((Z)—N′-hydroxycarbamimidoyl)phenyl)-2-methylpropan-2-yl)piperidine-3-carboxylate. MS (m+1)=364. HPLC Peak RT=0.27 minutes (Analytical Method B).
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