Sodium borohydride → tert-Butyl 3-[3-chloro-5-(1-hydroxyethyl)-6-methoxy-2-methylphenyl]azetidine-1-carboxylate
反応式
[C:1]([C:4]1[C:5]([O:23][CH3:24])=[C:6]([CH:12]2[CH2:15][N:14]([C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[CH2:13]2)[C:7]([CH3:11])=[C:8]([Cl:10])[CH:9]=1)(=[O:3])[CH3:2].[BH4-].[Na+]>CO>[Cl:10][C:8]1[C:7]([CH3:11])=[C:6]([CH:12]2[CH2:13][N:14]([C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[CH2:15]2)[C:5]([O:23][CH3:24])=[C:4]([CH:1]([OH:3])[CH3:2])[CH:9]=1参加物
4
実験手順
To a solution of tert-butyl 3-(3-acetyl-5-chloro-2-methoxy-6-methylphenyl)azetidine-1-carboxylate (1.3 g, 3.7 mmol) in methanol (20 mL) stirring at 0° C. was added sodium tetrahydroborate (0.167 g, 4.41 mmol). The mixture was stirred at 0˜5° C. for 1 hour. The reaction was quenched with water and extracted with EtOAc (3×). The combined extracts were dried over MgSO4, filtered and concentrated to give 1.3 g (100%) of the desired product. LCMS calculated for C18H26ClNO4Na (M+Na)+: m/z=378.2; Found: 378.1. 1H NMR (400 MHz, CDCl3): δ 7.37 (s, 1H), 5.10 (q, 1H), 4.30 (m, 2H), 4.14 (m, 3H), 3.63 (s, 3H), 2.25 (s, 3H), 1.48 (d, 3H), 1.44 (s, 9H) ppm.