反应详情

(6,7-difluoro-1H-benzimidazol-1-yl)acetic acid (42 mg, 0.2 mmol) prepared according to scheme 2 is dissolved in CH2Cl2 (2 mL). Triethylamine (83 μL, 0.6 mmol) is added, followed by pivaloyl chloride (25 μL, 0.2 mmol). After 30 minutes, 2-[4-(aminomethyl)phenyl]-2-methylpropanenitrile (35 mg, 0.2 mmol) prepared according to scheme 18 is added dissolved in 1 mL of CH2Cl2. The mixture is stirred overnight at room temperature, concentrated under vacuo and purified on HPLCMS: Waters prep LCMS, 27 ml/min, Column: X-Bridge Prep C18 OBD, 30×50 mm, 5 μm particle size, Mobile phase: A=water (10 mM NH4CO3) B=MeCN, Gradient used 40% to 60% B in A, in 10 min. The fractions are combined and freeze dried to give the desired product (17 mg, 0.05 mmol, 25%). MS (ESI) (M+1) 383.3. 1H NMR (400 MHz, DMSO-D6) δ ppm 1.65 (s, 6H) 2.30 (s, 3H) 4.29 (d, J=5.47 Hz, 2H) 5.09 (s, 2H) 7.19-7.31 (m, 3H) 7.32-7.35 (m, 1H) 7.47 (dd, J=8.98, 3.91 Hz, 1H) 8.22 (s, 1H) 8.66-8.74 (m, 1H).

1. additionis added
2. concentrationconcentrated under vacuo
3. custompurified on HPLCMS
4. waitin 10 min
5. customfreeze dried