Reaction Steps
1-Methylpiperazine (48 μL, 0.43 mmol) was added to a solution of Intermediate 96f (111 mg, 0.14 mmol) in THF (2 mL). The reaction was heated to 60° C. in a sealed vial overnight. 1-Methylpiperazine (48 μL, 0.43 mmol) was added and the reaction continued for a further 24 h. The mixture was cooled, evaporated in vacuo and the residue was purified by FCC, using 0-15% MeOH in DCM, then triturated with Et2O to give the title compound (42 mg, 38%) as an off-white solid. LCMS (Method 5): Rt 3.76 min, m/z 775.6 [MH+]. 1H NMR (400 MHz, do-DMSO): 0.60 (3H, d, J=6.0 Hz), 0.63 (3H, d, J=6.0 Hz), 1.28 (9H, s), 1.36-1.62 (3H, m), 1.65-1.75 (2H, m), 1.76-1.99 (3H, m), 2.03-2.12 (2H, m), 2.14-2.26 (3H, m), 2.34-2.61 (5H, m, obscured by solvent), 2.63-2.74 (3H, m), 3.11-3.24 (2H, m), 3.28-3.38 (2H, m), 4.1 (2H, t, J=5.8 Hz), 4.78-4.87 (1H, m), 5.50-5.56 (1H, m), 6.33 (1H, s), 6.93-7.00 (1H, m), 7.05-7.13 (3H, m), 7.20 (1H, dd, J=9.9, 2.4 Hz), 7.23-7.31 (2H, m), 7.34 (2H, t, J=8.0 Hz), 7.40 (1H, t, J=8.0 Hz), 7.67 (1H, d, J=9.9 Hz), 7.87-7.91 (1H, m), 8.11 (1H, s).
