using the commercially available and air‐stable iridium precatalyst [Ir(COD)(OMe)]2 is described. A large scope of pharmaceutically relevant substructures can be labelled using this method including pyridine, pyrazine, indole, carbazole, aniline, oxa‐/thia‐zoles, thiophene, but also electron‐rich phenyl groups. The high functional group tolerance of the reaction is highlighted by the labelling of a wide
Versatile Regioselective Deuteration of Indoles via Transition-Metal-Catalyzed H/D Exchange
作者:Jinquan Zhang、Shuaizhong Zhang、Thirupathi Gogula、Hongbin Zou
DOI:10.1021/acscatal.0c01674
日期:2020.7.17
deuteration of organic entities. Here, we present a highly effective regioselective direct C–H deuteration of indole in D2O using Cp*Co(CO)I2, [Cp*RhCl2]2, or their combination as a catalyst. This transition-metal-catalyzed system made available mono(C2)-, di(C2/C7)-, tri(C2/C3/C7)-, and even C4-deuterated products from diverse indole substrates, equipped with the removable N1-directing group. The selective
Indole and N-methylindole have been partially or fully deuterated by Raney nickel catalyzed H-1-H-2 exchange in a series of deuterated solvents. Perdeuterated indoles have been obtained in water and methanol while compounds that are preferentially deuterated at specific sites were obtained in chloroform, acetone, acetonitrile, ethanol, and isopropanol. The partially deuterated compounds are an important research tool for solid-state NMR studies on proteins.
Easy-to-Implement Hydrogen Isotope Exchange for the Labeling of <i>N</i>-Heterocycles, Alkylkamines, Benzylic Scaffolds, and Pharmaceuticals
importance due to the fundamental role of isotopically labeled compounds in drug discovery and development. Deuterated analogues of drugs are extensively used as internal standards for quantification purposes or as active pharmaceutical ingredients, whereas tritiated drugs are essential for preclinical ADME studies. In this report, we describe the labeling of prevalent substructures in FDA-approved drugs