Diethyl Ether → N-[3-(7-hydroxy-6-{6-[methyl-(2,2,6,6-tetramethyl-piperidin-4-yl)-amino]-pyridazin-3-yl}-naphthalen-2-yloxy)-propyl]-acetamide

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N-Acetoxysuccinimide (98 mg, 0.624 mmol) was added to a solution of Example 20-5 (50 mg, 0.108 mmol) and TEA (0.747 ml, 5.39 mmol) in DMSO (2 ml) at RT. The reaction mixture was stirred at RT for 30 min then concentrated in vacuo to remove excess Et3N. The resulting residue was purified by preparative HPLC (eluting with 5-80% MeCN/H2O with 0.1% TFA modifier). The appropriate fractions containing product were combined then adsorbed onto a MeOH conditioned SCX column (5 g, BSA Varian brand). The column was washed several times with MeOH then eluted with 3 N NH3 in MeOH. Evaporation of the solvent afforded a yellow oil. Et2O was added to the oil then concentrated to dryness affording the title compound as a yellowish orange solid (30 mg, 55% yield). LCMS Rt=0.52 min (LCMS method Q); MS (M+1)=506.2. 1H NMR (400 MHz, DMSO-d6) δ ppm 13.27 (br. s, 1H), 8.35 (s, 1H), 8.28 (d, J=10.10 Hz, 1H), 7.77 (d, J=9.09 Hz, 2H), 7.35 (d, J=9.60 Hz, 1H), 7.17 (s, 1H), 7.09 (d, J=2.02 Hz, 1H), 6.95 (dd, J=9.09, 2.53 Hz, 1H), 4.92-5.04 (m, 1H), 4.11 (t, J=6.32 Hz, 2H), 3.20-3.28 (m, 2H), 2.98 (s, 3H), 1.87-1.96 (m, 2H), 1.82 (s, 3H), 1.55-1.63 (m, 2H), 1.44-1.55 (m, 2H), 1.30 (s, 6H), 1.14 (s, 6H).

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