Pd<sub>2</sub>dba<sub>3</sub>/Bippyphos: A Robust Catalyst System for the Hydroxylation of Aryl Halides with Broad Substrate Scope
作者:Christopher B. Lavery、Nicolas L. Rotta-Loria、Robert McDonald、Mark Stradiotto
DOI:10.1002/adsc.201300088
日期:2013.3.25
4′]bipyrazole (Bippyphos) is shown to be a robust and efficient catalyst system for the hydroxylation of structurally diverse (hetero)aryl halides under mild conditions and with broad substrate scope. Included in this reactivity survey is the successful synthesis of substituted benzofurans and related heteroatomic derivatives, which are formed via the hydroxylation of 2‐haloalkynylarenes. Notably, a significant
三(二亚苄基丙酮)(0)(钯的混合物2 DBA 3)和5-(二-叔-butylphosphino)-1',3',5'-三苯基-1' ħ - [1,4'] bipyrazole (Bippyphos)被证明是在温和的条件下和广泛的底物范围内用于结构多样的(杂)芳基卤化物羟基化的强大而有效的催化剂体系。反应性调查中包括成功合成的取代苯并呋喃和相关杂原子衍生物,它们是通过2-卤代炔烃的羟基化 值得注意的是,本文报道的大量反应是在室温下进行的,并且我们已经证明,可以在空气中使用未纯化的溶剂在台式机上进行反应,而与在惰性气氛条件下进行的相关转化相比,反应活性的损失可忽略不计。我们还在本文中报道了第一个晶体学表征的(Bippyphos)Pd(II)配合物,该配合物证实了该合成有用的配体以类似于Buchwald的联芳基膦配体类别的方式采用双齿结合基序的能力。