Feedstocks to Pharmacophores: Cu-Catalyzed Oxidative Arylation of Inexpensive Alkylarenes Enabling Direct Access to Diarylalkanes
作者:Aristidis Vasilopoulos、Susan L. Zultanski、Shannon S. Stahl
DOI:10.1021/jacs.7b03387
日期:2017.6.14
A Cu-catalyzed method has been identified for selective oxidative arylation of benzylic C-H bonds with arylboronic esters. The resulting 1,1-diarylalkanes are accessed directly from inexpensive alkylarenes containing primary and secondary benzylic C-H bonds, such as toluene or ethylbenzene. All catalyst components are commercially available at low cost, and the arylboronic esters are either commercially
已经确定了一种 Cu 催化的方法,用于苄基 CH 键与芳基硼酸酯的选择性氧化芳基化。所得的 1,1-二芳基烷烃可直接从含有伯和仲苄基 CH 键的廉价烷基芳烃(如甲苯或乙苯)中获得。所有催化剂组分均可以低成本商购获得,并且芳基硼酸酯可商购获得或容易从商购硼酸获得。强调了这些方法在药物化学应用中的潜在效用。
Improved Preparation of 4,6,6-Trimethyl-1,3,2-dioxaborinane and Its Use in a Simple [PdCl<sub>2</sub>(TPP)<sub>2</sub>]-Catalyzed Borylation of Aryl Bromides and Iodides
作者:Nageswaran PraveenGanesh、Pierre Yves Chavant
DOI:10.1002/ejoc.200800526
日期:2008.9
We describe a convenient preparation of 4,6,6-trimethyl-1,3,2-dioxaborinane (MethylPentaneDiolBorane, MPBH) and demonstrate that it is an excellent reagent for the [PdCl2(PPh3)2]-catalyzed borylation of aryl bromides and iodides. The corresponding boronic esters undergo rapid Suzuki coupling reactions in the presence of cesium fluoride. Thus, MPBH is an excellent alternative to pinacolborane for Pd-catalyzed
The cross-coupling of aryl arenesulfonates with dialkoxyboranes proceeded in the presence of Bu4NI and a catalytic amount of [Pd(dba)2]/1,1′-bis(di-tert-butylphosphano)ferrocene, giving good yields...
The nickel-catalyzed borylation of aryl iodides and bromides with 4,4,6-trimethyl-1,3,2-dioxaborinane was achieved. The mild reaction conditions employed allowed for the inclusion of common functional groups in aryl halides to be tolerated. A DFT study on the catalytic cycle shows that C-B bond formation occurs through sigma-bond metathesis between dialkoxyborane and arylnickel(II) halide intermediates.