反应详情

(6,7-difluoro-1H-benzimidazol-1-yl)acetic acid (91 mg, 0.43 mmol) prepared according to scheme 2 is dissolved in DCM (3 mL). DIPEA (0.1 mL) is added, followed by pivaloyl chloride (53 μL, 0.43 mmol). After 1 hour, 2-[4-(aminomethyl)-3-methylphenyl]-2-methylpropanenitrile (80 mg, 0.43 mmol) prepared according to scheme 19 is added. 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 30% to 50% B in A, in 10 min. The fractions are combined and freeze dried to give the desired product (59 mg, 0.15 mmol, 35%). MS (ESI) (M+1) 369.2. 1H NMR (400 MHz, DMSO-D6) δ ppm 1.67 (s, 6H) 4.33 (d, J=5.86 Hz, 2H) 5.10 (s, 2H) 7.23 (ddd, J=11.62, 8.89, 7.62 Hz, 1H) 7.32 (d, J=8.59 Hz, 2H) 7.44-7.51 (m, 3H) 8.21 (s, 1H) 8.80 (t, J=5.86 Hz, 1H).

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