Reaction Steps
The product from Example 152C (102 mg, 0.392 mmol) was dissolved in dichloromethane (1 mL) followed by addition of 3-trifluoromethylphenylacetic acid (88 mg, 0.431 mmol) and 1H-benzo[d][1,2,3]triazol-1-ol hydrate (66.0 mg, 0.431 mmol). The mixture was stirred for 5 minutes and then N1-((ethylimino)methylene)-N3,N3-dimethylpropane-1,3-diamine (76 μL, 0.431 mmol) was added. After stirring for 18 hours at ambient temperature, the mixture was partitioned between water and dichloromethane. The organic layer was dried over Na2SO4, filtered and concentrated in vacuo. The crude product was purified by flash chromatography on a 24 g silica gel column, eluting with 2.5% methanol (containing 2 N ammonia) in dichloromethane for 3 minutes and then a gradient to 10% methanol (2 N ammonia) in dichloromethane to afford the title compound as a viscous colorless oil (101 mg, 57.7%). 1H NMR (300 MHz, CDCl3) δ ppm 1.76-2.15 (m, 2H), 2.18 (s, 3H), 2.19-2.37 (m, 2H), 2.37-2.53 (m, 1H), 2.69-2.91 (m, 1H), 2.91-3.05 (m, 1H), 3.14-3.29 (m, 1H), 3.65-3.78 (m, 1H), 3.80 (d, J=3.3 Hz, 2H), 3.93 (dd, J=12.5, 2.0 Hz, 1H), 4.64 (ddd, J=10.3, 5.9, 4.5 Hz, 1H), 4.74-4.83 (m, 1H), 5.23 (d, J=1.4 Hz, 1H), 5.39 (tdd, J=7.2, 5.2, 1.9 Hz, 1H), 5.80 (s, 1H), 7.49 (ddd, J=16.3, 4.6, 2.8 Hz, 3H), 8.14 (t, J=1.4 Hz, 1H), 8.18-8.23 (m, 1H); MS (ESI) m/z 447 (M+H)+.
