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2-(2-二环己基磷杂NYL-苯基)-1-甲基-1H-吲哚是一种有机膦配体,常用于Suzuki-Miyaura偶联反应。2-(2-二环己基磷杂NYL-苯基)-1-甲基-1H-吲哚可由N-甲基-2-苯基-3-溴吲哚与氯二环己基膦一步制备得到。
在室温和氮气氛下,将N-甲基-2-苯基-3-溴吲哚(0.855 g,3.0 mmol)溶于新鲜蒸馏的THF(20mL)中。 在干冰/丙酮浴中将溶液冷却至-78℃。通过注射器滴加滴定的正丁基锂(3.3mmol)。 将反应混合物在-78℃下搅拌30分钟后,加入氯二环己基膦(0.66mL,3.3mmol)的THF(5mL)溶液。 使反应升温至室温并搅拌过夜。 减压除去溶剂。 真空除去溶剂后,将产物依次用冷的MeOH / EtOH混合物洗涤,然后真空干燥。 该产品是2-(2-二环己基磷杂NYL-苯基)-1-甲基-1H-吲哚,白色固体(0.85g,71%)。 熔点:122.0-123.2°C。1H NMR (400 MHz, C6D6) δ1.19-2.55 (m, 22H), 3.08 (s, 3H), 7.19-7.39 (m, 6H), 7.51 (d, J=7.3 Hz, 2H), 8.16-8.18 (m, 1H);13C NMR (100 MHz,CDCl3) δ 26.8, 27.3, 27.5 (overlapped), 27.6, 30.7 (overlapped), 31.0, 31.1,32.5, 32.8, 34.8, 34.9, 105.1, 105.3, 110.3, 120.5, 122.1 (Overlapped), 127.8, 127.9, 131.3(overlapped), 132.1 (overlapped), 133.3 (overlapped), 138.8 (overlapped), 149.8, 150.2(unresolved complex C-P splittings were observed); 31P NMR (162 MHz, C6D6) δ -18.36; IR(cm-1) 3049.36, 2921.78, 2845.98, 1465.12, 1443.10, 1372.54, 1336.47, 1264.83, 1106.31,1021.29, 887.02, 849.63, 795.91, 737.94, 698.91, 619.86, 550.50; MS (EI): m/z (relative
intensity) 403(M+, 25), 348 (5), 321 (30), 238 (100), 222 (25), 207 (10); HRMS: calcd. forC27H34NPH+: 404.2507, found 404.2511.
Chau Ming So等人将吲哚基膦配体家族如2-(2-二环己基磷杂NYL-苯基)-1-甲基-1H-吲哚用于芳基甲苯磺酸酯的Suzuki-Miyaura交叉偶联。对于未活化的甲苯磺酸芳基酯的偶联,催化剂的负载量可降低至0.2 mol%。
[1] Chau Ming So, Chak Po Lau, Albert S. C. Chan, and Fuk Yee Kwong,The Journal of Organic Chemistry 2008 73 (19), 7731-7734,DOI: 10.1021/jo8014819