Extremely Efficient Cross-Coupling of Benzylic Halides with Aryltitanium Tris(isopropoxide) Catalyzed by Low Loadings of a Simple Palladium(II) Acetate/Tris(p-tolyl)phosphine System
Highly efficient coupling reactions of benzylic bromides or chlorides with aryltitaniumtris(isopropoxide) [ArTi(O‐i‐Pr)3] catalyzed by a simplepalladium(II) acetate/tris(p‐tolyl)phosphine [Pd(OAc)2/ P(p‐tolyl)3] system are reported. The coupling reactions proceed in general at room temperature employing low catalyst loadings of 0.02 to 0.2 mol%, affording coupling products in excellent yields of
Abstract A palladium-catalyzed reductive coupling between N-tosylhydrazones and arylbromides has been developed. The reaction provides an efficient method for the synthesis of diarylmethanes and triarylmethanes via the formation of C(sp2)–C(sp3) single bonds. This new methodology for the synthesis of diarylmethanes and triarylmethanes is featured by the ready availability of the starting materials
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。
Aromatic reactivity
作者:C. Eaborn、Z. Lasocki、J.A. Sperry
DOI:10.1016/s0022-328x(00)89797-1
日期:1972.2
Rates of cleavage by aqueous methanolic perchloric acid have been measured for 4-(trimethylsilyl)diphenylmethane, 2-, 3-, and 9-(trimethylsilyl)phenanthrene, 2-(trimethylsilyl)-9,10-dihydrophenanthrene, and 1-(trimethylsilyl)pyrene. The values of the rates, krel, relative to those for trimethylsilylbenzene at 50δ are 7.9, 1.76, 2.1, 4.5, 12.8, and 223, respectively. In a plot of log krel against logf