Streamlined Synthesis of the Bippyphos Family of Ligands and Cross-Coupling Applications
作者:Gregory J. Withbroe、Robert A. Singer、Janice E. Sieser
DOI:10.1021/op7002858
日期:2008.5.1
the efficient preparation of Bippyphos, 1. The key precursor to Bippyphos, 5, was prepared via a one-pot bromination of diketone 2 followed by alkylation with pyrazole and condensation with phenylhydrazine. Lithiation of 5 and trapping with di-tert-butylchlorophosphine afforded Bippyphos, 1. Using this approach we have prepared several derivatives of Bippyphos to probe the structure and activity relationships
我们描述了Bippyphos,1的有效制备方法。Bippyphos的关键前体5是通过二锅2的一锅溴化反应,然后用吡唑烷基化并与苯肼缩合制备的。5的锂化并用二叔丁基氯膦捕获,得到Bippyphos,1。使用这种方法,我们已经制备了Bippyphos的几种衍生物,以探测该膦配体家族的结构和活性之间的关系。我们还证明了这些配体在钯催化的胺化反应和其他交叉偶联反应中的效用。