2-Bromo-1,5,6,7-tetrahydro-4H-indol-4-one → 2-(3-(tert-butylamino)-2-methylquinoxalin-5-yl)-6,7-dihydro-1H-indol-4(5H)-one

関与物質

反応条件

反応手順

A mixture of N-(tert-butyl)-3-methyl-8-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)quinoxalin-2-amine (174b) (222.6 mg, 0.652 mmol), 2-bromo-6,7-dihydro-1H-indol-4(5H)-one (303a; 209 mg, 0.978 mmol), K2PO4 (415 mg, 1.957 mmol), (Strem Chemicals, Inc., 31.1 mg, 0.065 mmol), and Pd2dba3 (Aldrich, 29.9 mg, 0.033 mmol) in a mixture of dioxane (4.5 mL) and water (0.900 mL) was heated under argon at 105° C. for 1 h. The reaction mixture was subsequently cooled to RT and diluted with water (30 mL). The resulting mixture was extracted with 5% MeOH/DCM (3×30 mL), and the combined extracts were dried over Na2SO4, filtered, and concentrated onto silica gel. Chromatographic purification (silica gel, 0-100% EtOAc/hexanes) furnished 2-(3-(tert-butylamino)-2-methylquinoxalin-5-yl)-6,7-dihydro-1H-indol-4(5H)-one (175 mg, 0.502 mmol, 77% yield) as a yellow solid: 1H NMR (400 MHz, CDCl3) δ ppm 12.52 (1H, br. s.), 7.96 (1H, dd, J=7.6, 1.0 Hz), 7.73 (1H, d, J=7.8 Hz), 7.40 (1H, t, J=7.8 Hz), 7.08 (1H, d, J=2.0 Hz), 4.89 (1H, s), 2.93 (2H, t, J=6.2 Hz), 2.60 (3H, s), 2.51-2.57 (2H, m), 2.23 (2H, quin, J=6.3 Hz), 1.68 (9H, s). m/z (ESI, +ve) 349.2 (M+H)+.

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