To a stirred solution of 1-(6-cyclopropoxyquinolin-2-yl)-2-methyl-1-(1-((2-(trimethylsilyl)ethoxy)methyl)-1H-1,2,3-triazol-5-yl)propan-1-ol (AR) (0.35 g, 0.77 mmol) in THF (5 mL) was added CsF (0.42 g, 3.08 mmol) followed by TBAF (1 mL, 0.77 mmol, 1M solution in THF) at RT and stirred under reflux for 12 h under inert atmosphere. After consumption of the starting material (by TLC), the reaction mixture was quenched with water (20 mL) and extracted with EtOAc (3×30 mL). The combined organic layer was washed with water, brine and dried over anhydrous Na2SO4 and concentrated under reduced pressure. The obtained crude product was purified by silica gel column chromatography using 30% EtOAc/hexane as eluent to afford 8 (85 mg, 0.26 mmol, 33%) as off-white solid. 1H NMR (500 MHz, CDCl3): δ 11.82-11.60 (br s, 1H), 8.08 (d, J=9.0 Hz, 1H), 7.97 (d, J=10.0 Hz, 1H), 7.81 (br s, 2H), 7.38-7.36 (m, 2H), 6.62 (s, 1H), 3.85-3.84 (m, 1H), 2.82-2.80 (m, 1H), 0.98 (d, J=7.0 Hz, 3H), 0.87-0.83 (m, 4H), 0.64 (d, J=7.0 Hz, 3H). HPLC: 98.3%. MS (ESI): m/z 325.9 [M++1].
