Aryl imidazole-1-sulfonates are efficiently cross-coupled with arylboronic acids and potassium aryltrifluoroborates using only 0.5 mol % of oxime palladacycles 1 under aqueous conditions at 110 °C. Under these simple phosphane-free reaction conditions a wide array of biaryl derivatives has been prepared in high yields. This methodology allows in situ phenol sulfonation and one-pot Suzuki arylation as well as the employment of microwave irradiation conditions.
基于
水相条件、温度110°C下,仅使用0.5摩尔%的
肟基
钯杂环1,就能高效地实现芳基
咪唑-1-
磺酸盐与芳基
硼酸及芳基三
氟硼酸盐的交叉偶联。在这些简单的无膦反应条件下,大量的
联苯衍
生物已经以高产率制备完成。该方法学能够实现
酚羟基的定向磺化、一步Suzuki偶联反应以及利用微波辐照条件。