右美托咪定杂质47

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a suspension of sodium hydride (35.1 mg, 1.46 mmol) in anhydrous THF (3.0 mL) under nitrogen was added 2-(2,3-dimethylphenyl)ethanol (220 mg, 1.46 mmol). The reaction mixture was stirred at room temperature for 15 min and then a solution of 1-(5-bromo-3,4-dihydroquinolin-1(2H)-yl)-2-chloroethanone (352 mg, 1.22 mmol) in anhydrous THF (3.0 mL) was added. The resulting mixture was stirred at room temperature for 18 h. After this time, the reaction mixture was diluted with saturated sodium bicarbonate (55 mL) and then extracted with ethyl acetate (60 mL). The organic layer was dried over anhydrous Na2SO4, filtered, and concentrated. The resulting residue was purified by preparative HPLC (PHENOMENEX® Axia Luna, 5μ, C18, 30×250 mm; 25 min gradient from 80% A:20% B to 0% A:100% B and 5 min 100% B (A=90% H2O/10% MeOH+0.1% TFA); (B=90% MeOH/10% H2O+0.1% TFA); detection at 220 nm) to afford the title compound (55 mg, 11% yield) as white powder. LCMS, [M+H]+=402.1. 1H NMR (400 MHz, CDCl3) δ 7.37 (d, J=8.0 Hz, 1H), 7.30 (br. s, 1H), 7.02-6.96 (m, 4H), 4.20 (s, 2H), 3.74-3.69 (m, 2H), 3.66 (t, J=7.4 Hz, 2H), 2.92 (t, J=7.4 Hz, 2H), 2.78 (t, J=6.9 Hz, 2H), 2.24 (s, 3H), 2.18 (s, 3H), 1.99-1.90 (m, 2H). The resulting mixture was stirred at room temperature for 18 h extracted with ethyl acetate (60 mL) The organic layer was dried over anhydrous Na2SO4 filtered concentrated The resulting residue was purified by preparative HPLC (PHENOMENEX® Axia Luna, 5μ, C18, 30×250 mm 25 min gradient 100% B and 5 min 100% B