Dimethyl Sulfoxide → 2-(4-(8-((4-Methoxybenzyl)oxy)quinoline-4yl)piperazine-1yl)acetaldehyde

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To a stirred solution of oxalyl chloride (1.8 mL, 20.33 mmol) in CH2Cl2 (40 mL) at −78° C. was added DMSO (2.8 mL, 40.66 mmol). The reaction mixture was stirred for 10 minutes followed by addition of compound 26 (4.0 g, 10.16 mmol, solution in 10 mL of CH2Cl2). The reaction mixture was stirred at the same temperature for 12 minutes. Then Et3N (8.4 mL, 60.98 mmol) was added and stirring was continued for another 1 hour and 20 minutes allowing the reaction mixture to come to room temperature. The reaction mixture was quenched by addition of water and extracted with CH2Cl2 (3×75 mL). The combined organic layer was washed with water and brine and finally purified by silica gel column chromatography (EtOAc/MeOH, 9.5:0.5) to yield 3.06 g (77%) of compound 27 as thick oil. 1H NMR (400 MHz, CDCl3) δ ppm 2.45-2.90 (m, 4H), 3.02-3.40 (m, 4H), 3.34 (s, 2H), 3.69 (s, 3H), 5.25 (s, 2H), 6.64-7.04 (m, 4H), 7.16-7.56 (m, 4H), 8.60-8.76 (m, 1H), 9.68 (s, 1H).

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