8-Hydroxyquinoline → HCID 57950370, compound

Participants

Reaction Conditions

Reaction Steps

tert-Butyl-7-bromo-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indole-2(5H)-carboxylate (0.19 g, 0.54 mmol), 4-(4-methoxyphenyl)pyridin-2(1H)-one (90 mg, 0.45 mmol) and Cs2CO3 (0.16 g, 0.49 mmol) were suspensed in DMSO (2.0 mL) and degassed under vacuum for 15 min. The system was then flushed with Ar and 8-hydroxyquinoline (19 mg, 0.13 mmol) and copper iodide (0.10 g, 0.54 mmol) were added. The degassing/Ar flushing process was repeated twice more, and the reaction mixture was heated at 133° C. for 18 h under N2. The suspension was cooled, diluted with 20% NH4OH/MeOH (25 mL) and stirred at ambient temperature for 30 min. The suspension was further diluted with CH2Cl2 (100 mL). The solution was filtered through silica gel and concentrated under reduced pressure. The concentrate was diluted with CH2Cl2 and washed with brine (3×25 mL). The organic phase was dried over Na2SO4, filtered and concentrated to dryness. Flash column chromatography (12 g ISCO column, (1:1 hexanes/EtOAc)/(80:18:2 CH2Cl2/MeOH/NH4OH), 100:0 for 10 column volumes, increased to 50:50 over 20 column volumes and then hold for 5 column volumes) gave the title compound (75 mg, 34%) as a yellow solid: 1H NMR (500 MHz, CDCl3) δ 7.60 (d, J=9.0 Hz, 2H), 7.53 (d, J=8.0 Hz, 1H), 7.46 (d, J=7.5 Hz, 1H), 7.37 (d, J=1.5 Hz, 1H), 7.08 (d, J=7.5 Hz, 1H), 7.00 (d, J=9.0 Hz, 2H), 6.86 (d, J=2.0 Hz, 1H), 6.50 (dd, J=7.0, 2.0 Hz, 1H), 4.66-4.64 (m, 2H), 3.87 (s, 3H), 3.85-3.84 (m, 2H), 3.64 (s, 3H), 2.84-2.83 (m, 2H), 1.50 (s, 9H).

Provenance & Evidence