A direct route to six and seven membered lactones <i>via</i> γ-C(sp<sup>3</sup>)–H activation: a simple protocol to build molecular complexity
作者:Jayabrata Das、Pravas Dolui、Wajid Ali、Jyoti Prasad Biswas、Hediyala B. Chandrashekar、Gaurav Prakash、Debabrata Maiti
DOI:10.1039/d0sc03144e
日期:——
Lactones comprise a class of valuable compounds having biological as well as industrial importance. Development of a methodology to synthesize such molecules directly from readily available materials such as aliphatic carboxylic acid is highly desirable. Herein, we have reported synthesis of δ-lactones and ε-lactones via selective γ-C(sp3)–H activation. The γ-C–H bondcontaining aliphatic carboxylic
Catalyst Control in Switching the Site Selectivity of C−H Olefinations of 1,2‐Dihydroquinolines: An Approach to Positional‐Selective Functionalization of Quinolines
olefinations exclusively at the C-3- or C-8-positions in the quinoline framework has been developed by catalystcontrol. Distal C(3)-H functionalization is achieved by using palladium catalysis, whereas proximal C(8)-H functionalization is obtained by employing ruthenium catalysis. Switching the siteselectivity within a single substrate directly indicates two diverse pathways, which are operating under the
Photoredox Activation of Formate Salts: Hydrocarboxylation of Alkenes via Carboxyl Group Transfer
作者:Yan Huang、Jing Hou、Le-Wu Zhan、Qian Zhang、Wan-Ying Tang、Bin-Dong Li
DOI:10.1021/acscatal.1c04684
日期:2021.12.17
reagent, a widerange of alkenes can be converted into acid products via a carboxyl group transfer strategy in an additive-free fashion. Mechanistic studies revealed that radical anion species (CO2•– and carbon radical anions derived from the reduction of alkenes) are key intermediates of the transformation. This method has the advantages of high catalytic efficiency and a simplecatalytic system, which