(S)-3-bromo-N-(3,3-dimethyl-1-(methylamino)-1-oxobutan-2-yl)-7-methyl-5,6,7,8-tetrahydroimidazo[1,5-a]pyrazine-1-carboxamide (Compound 203; 0.12 g, 0.31 mmol) was dissolved in dioxane (4 mL) and (E)-3-chloroprop-1-enylboronic acid (0.037 g, 0.31 mmol) was added, followed by K2CO3 (0.11 g. 0.82 mmol), morpholine (0.054 g, 0.66 mmol) and water (0.80 mL). The resulting mixture was degassed with nitrogen and Pd(PPh3)4 (0.019 g, 0.017 mmol) was added. The mixture was subjected to microwave irradiation at 160° C. for 20 min. The mixture was diluted with EtOAc, and filtered through celite. The organic layer was concentrated, washed with water, dried over anhydrous Na2SO4, filtered and concentrated again. The residue was purified by prep LC/MS using 5-95% gradient acetonitrile/water with 0.1% formic acid to provide Compound 286 (0.035 g, 34%) as a yellow solid. 1H-NMR (400 MHz, CDCl3) δ: 1.07 (s, 9H), 2.52 (s, 3H), 2.81 (d, 3H), 2.89 (t, 2H), 2.97 (m, 3H), 3.28 (s, 1H), 3.58 (d, 1H), 3.99 (m, 8H), 4.35 (d, 1H), 6.11 (m, 1H), 6.68 (m, 2H), 7.71 (m, 1H); LCMS (+ESI) m/z 433.3 [M+H]+.
