37% |
With 1,2,3-trimethoxybenzene; O4P(3-)*3K(1+)*5H2O; tris(1-adamantyl)phosphine; {2-[((acetyl-kappaO)amino)phenyl-kappaC](tri-1-adamantylphosphine)palladium}(p-toluenesulfonate); In tetrahydrofuran; at 100℃; for 5h;Inert atmosphere; |
To a mixture of glibenclamide (247 mg, 0.50 mmol, 1 equiv), N-Boc-pyrroleboronic acid (127 mg, 0.60 mmol, 1.2 equiv), 1,3,5-trimethyoxybenzene (84 mg, 0.50 mmol, 1 equiv) as internal standard, and K3P045H20 (0.36 g, 1.2 mmol, 2.4 equiv) was added a THF stocksolution of 3 and PAd3 (2 mL in THF, 5 imol of Pd/PAd3). The mixture was stirred at 100 C for 5 h. The crude NMR yield was 65 % versus the internal standard. The reaction mixture was diluted with ethyl acetate then extracted with water. The combine organic layers were evaporated and the crude product was purified by flash chromatography and preparative HPLC. After drying, 116 mg (37 %) of 16 was obtained as a white solid.1H NMR (501 MHz, CDC13) 8.13 (d, J 2.4 Hz, 1H), 7.83 (t, J= 5.8 Hz, 1H), 7.78 (d, J= 8.3Hz, 2H), 7.43 -7.31 (m, 3H), 7.26 (dd, J= 3.3, 1.8 Hz, 1H), 6.86 (d, J 8.5 Hz, 1H), 6.37 (d, J= 7.9 Hz, 1H), 6.14 (t, J- 3.3 Hz, 1H), 6.11 (dd, J= 3.3, 1.8 Hz, 1H), 3.75 (s, 3H), 3.69 (q, J=6.6 Hz, 2H), 3.56-3.47 (m, 1H), 2.96 (t, J= 6.9 Hz, 2H), 1.80-1.72 (m, 2H), 1.64-1.46 (m, 4H),1.34 (s, 9H), 1.30- 1.03 (m, 4H).?3C{?H} NMR (126 MHz, CDC13) 165.2, 156.6, 150.1, 149.2, 146.3, 137.7, 133.8, 133.6,133.0, 129.9, 127.7, 127.2, 122.6,120.3, 114.7, 110.6, 110.6, 83.7, 56.0, 49.2, 40.5, 35.7, 33.0,27.8, 25.4, 24.6.HRMS (ESI) m/z calculated for C32H40N407S (M+1) 625.2691, found 625.2700. |