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A mixture of 4-(2-fluoro-5-((4-(methylsulfonyl)piperazin-1-yl)methyl)pyridin-3-yl)-N,N-bis(4-methoxybenzyl)-6-methyl-1,3,5-triazin-2-amine (Example 128; 60.0 mg, 0.097 mmol) and benzo[d]thiazol-5-amine (29.0 mg, 0.193 mmol) (Maybridge, Trevillet, UK) in THF (1.0 mL) at 0° C. was treated with LiHMDS (1.0 M in THF, Aldrich, St. Louis, Mo.) (483 μL, 0.483 mmol) dropwise via syringe. The reaction was stirred at 0° C. for 15 min, then was quenched with sat. aq. NH4Cl (3 mL). The aqueous layer was extracted with EtOAc (3×20 mL) and the combined organic layers were dried (MgSO4), filtered and concentrated in vacuo. The residue was purified by flash chromatography on silica eluting with a gradient of 10-35% EtOAc in DCM with 1% MeOH to give N-(3-(4-(bis(4-methoxybenzyl)amino)-6-methyl-1,3,5-triazin-2-yl)-5-((4-(methylsulfonyl)piperazin-1-yl)methyl)pyridin-2-yl)benzo[d]thiazol-5-amine (51.0 mg, 0.068 mmol, 70.3% yield) as an orange solid. 1H NMR (400 MHz, CDCl3) δ 9.16 (1H, br. s.); 8.99 (1H, s); 8.40-8.54 (2H, m); 7.84 (1H, d, J=8.8 Hz); 7.58 (1H, d, J=8.6 Hz); 7.12-7.25 (4H, m); 6.77-6.92 (4H, m); 4.93 (2H, s); 4.89 (2H, s); 4.15 (2H, s); 3.79 (12H, d, J=18.0 Hz); 3.35-3.51 (2H, m); 2.87-2.97 (2H, m); 2.85 (3H, s); 2.69 (3H, s). m/z (ESI, positive ion) 752 (M+H)+.

1. customwas quenched with sat. aq. NH4Cl (3 mL)
2. extractionThe aqueous layer was extracted with EtOAc (3×20 mL)
3. dry with materialthe combined organic layers were dried (MgSO4)
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customThe residue was purified by flash chromatography on silica eluting with a gradient of 10-35% EtOAc in DCM with 1% MeOH