Reacción #1563915

Ecuación de reacción

Sodium methoxide

3-[1-(3-Hydroxy-propyl)-2-(2-phenyl-propyl)-1H-benzimidazol-5-yl]-acrylic acid methyl ester

hydroxylamine hydrochloride

→

N-Hydroxy-3-[1-(3-hydroxy-propyl)-2-(2-phenyl-propyl)-1H-benzimidazol-5-yl]-acrylamide

Rendimiento 6.0%

Disolventes

MeOH

Condiciones de reacción

Tratamiento posterior

1. 1
   ExtracciónThe mixture was extracted with dichloromethane
2. 2
   SecadoThe organic layer was dried (MgSO4)
3. 3
   Filtraciónfiltered
4. 4
   Concentraciónconcentrated
5. 5
   OtroThe desired product was separated by reverse phase preparative HPLC

Procedimiento

Sodium methoxide (30% in methanol) (782 mg, 4.1 mmol) was added to a prestirred solution of 3-[1-(3-Hydroxy-propyl)-2-(2-phenyl-propyl)-1H-benzimidazol-5-yl]-acrylic acid methyl ester (130 mg, 0.34 mmol and hydroxylamine hydrochloride (242 mg, 3.4 mmol in MeOH (1.5 mL). The reaction mixture was continuously stirred for 40 minutes at room temperature and then poured into a solution of ice-water containing 1.0 mL concentrated hydrochloric acid. The mixture was extracted with dichloromethane. The organic layer was dried (MgSO4), filtered and concentrated. The desired product was separated by reverse phase preparative HPLC. After lyopholyzation, 7.8 mg (6%) of N-Hydroxy-3-[1-(3-hydroxy-propyl)-2-(2-phenyl-propyl)-1H-benzimidazol-5-yl]-acrylamide was obtained as powder. HPLC: 96%; tR=(LC/PDA: Phenomenex Luna C18 2.0×150 mm 5μ column; 0.8 mL/min, gradient 5-65% B over 15.5 min, Solvent A: H2O with 0.1% trifluoroacetic acid; Solvent B: Acetonitrile with 0.1% trifluoroacetic acid; UV 254): 7.22 min; 92%. 1H NMR (400 MHz, DMSO-d6) δ 1.35 (3H, d, J=6.5 Hz), 1.83 (2H, m), 3.00-4.00 (6H, m), 4.33 (2H, t, J=7.1 Hz), 6.55 (1H, d, J=15.8 Hz), 7.19-7.33 (5H, m), 7.62 (1H, d, J=15.8 Hz), 7.70 (1H, d, J=8.60 Hz), 7.82 (1H, d, J=8.60 Hz), 7.92 (1H, s), 10.15 (1H, bs), 10.33 (1H, bs). MS(m/z): 380 [MH]+.

Fuente