反应详情

8-Bromo-2-chloroquinazoline (D-L Chiral Chemicals, LLC, Princeton, N.J.) (200 mg, 0.82 mmol) was treated with DMF (2.0 mL) and 2-methylpropan-2-amine (Aldrich Chemical Company, 0.44 mL, 4.11 mmol) and stirred at RT overnight (17 h). The reaction mixture was treated with water, extracted with EtOAc (30 mL), washed with brine (2×), dried over MgSO4, filtered and concentrated. The crude residue was purified on the ISCO Combiflash RF (12 g Thomson SingleStep column, using a gradient of 0-50% EtOAc in hexanes) affording 8-bromo-N-(tert-butyl)quinazolin-2-amine (374a) (94 mg, 0.34 mmol, 41% yield) as a light yellow amorphous solid. 1H NMR (400 MHz, CDCl3) δ ppm 8.87 (1H, s), 7.95 (1H, dd, J=7.5, 1.3 Hz), 7.58 (1H, dd, J=7.9, 1.3 Hz), 7.05 (1H, t, J=7.7 Hz), 5.43 (1H, br. s.), 1.54 (9H, s). m/z (ESI, +ve ion) 280.0/282.0 (M+H)+. A 5-mL glass microwave reaction vessel was charged with 2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-6,7-dihydro-1H-pyrrolo[3,2-c]pyridin-4(5H)-one (609) (120 mg, 0.46 mmol), K2PO4 (182 mg, 0.86 mmol), Pd2dba3 (Strem Chemicals, 13.07 mg, 0.014 mmol), Xphos (Strem Chemicals, 13.61 mg, 0.03 mmol) and 8-bromo-N-(tert-butyl)quinazolin-2-amine (374a) (80 mg, 0.29 mmol) in dioxane (2.5 mL) and water (0.80 mL). The reaction was stirred and heated in a heating block at 110° C. for 1 h. The reaction mixture was treated with water, extracted with EtOAc (30 mL), washed with brine and concentrated. The crude residue was purified on the ISCO Combiflash RF (25 g Thomson SingleStep column, using a gradient of 0-20% MeOH) affording 2-(2-(tert-butylamino)quinazolin-8-yl)-6,7-dihydro-1H-pyrrolo[3,2-c]pyridin-4(5H)-one (53.9 mg, 0.16 mmol, 56% yield) as a light yellow amorphous solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 12.37 (1H, br. s.), 9.17 (1H, s), 8.10 (1H, d, J=6.8 Hz), 7.64 (1H, d, J=7.0 Hz), 7.35 (1H, s), 7.25 (1H, t, J=7.6 Hz), 7.05 (1H, br. s.), 6.98 (1H, br. s.), 3.40-3.47 (3H, m), 2.92 (2H, br. s.), 1.52 (9H, s). m/z (ESI, +ve ion) 336.0 (M+H)+.

1. extractionextracted with EtOAc (30 mL)
2. washwashed with brine (2×)
3. dry with materialdried over MgSO4
4. filtrationfiltered
5. concentrationconcentrated
6. customThe crude residue was purified on the ISCO Combiflash RF (12 g Thomson SingleStep column