Reaction Steps
To a solution of Intermediate 121a (0.07 mmol) in THF (2 mL) was added DIPEA (50 μL, 0.29 mmol) and morpholine (25 μL, 0.29 mmol) and the reaction stirred at 50° C. for 24 h. The crude reaction mixture was cooled and partitioned between EtOAc and water. The aqueous phase was extracted with EtOAc (×3) and the combined organic layers were washed with brine, dried (MgSO4) and concentrated in vacuo. The resultant residue was purified by FCC on silica, using a gradient of 0-10% [2M NH3 in MeOH] in DCM followed by MDAP (Method 7) purification, to give the title compound (19 mg, 39%). LCMS (Method 5): Rt 3.65 min, m/z 670 [MH+]. 1H NMR (400 MHz, d6-DMSO): 0.56 (3H, d, J=6.2 Hz), 0.59 (3H, d, J=6.2 Hz), 1.16 (9H, s), 1.37-1.55 (3H, m), 1.63-1.69 (2H, m), 1.73-1.79 (1H, m), 1.85-2.00 (2H, m), 2.04-2.10 (2H, m), 2.34 (4H, t, J=4.5 Hz), 2.57 (2H, t, J=7.2 Hz), 3.09-3.19 (2H, m), 3.50 (4H, t, J=4.5 Hz), 3.95 (2H, t, J=7.2 Hz), 4.82 (1H, td, J=8.6, 5.7 Hz), 5.50 (1H, t, J=4.2 Hz), 5.99 (1H, s), 6.92 (1H, d, J=8.6 Hz), 7.18 (1H, dd, J=9.8, 2.3 Hz), 7.20-7.26 (1H, m), 7.30-7.36 (3H, m), 7.62 (1H, dd, J=9.7, 0.6 Hz), 7.86 (1H, d, J=2.1 Hz), 8.19 (1H, s).
