Rh/Lewis Acid Catalyzed Regio-, Diastereo- and Enantioselective Addition of 2-Acyl Imidazoles with Allenes
作者:Pranjal P. Bora、Gui-Jun Sun、Wei-Feng Zheng、Qiang Kang
DOI:10.1002/cjoc.201700596
日期:2018.1
A highly regio‐, diastereo‐ and enantioselective addition of 2‐acylimidazoles or 2‐acyl pyridines with allenes promoted by Rh/Lewis acid synergistically catalytic system is described. This atom economic approach leads to the formation of the branched allylic alkylated products including acyclic quaternary all‐carbon stereogenic centres in good yields with good to excellent diastereo‐ and enantioselectivities
Imidazo[1,2-a]pyridines are disclosed. Compounds of the invention are useful therapeutic agents and their inclusion in pharmaceutical formulations and use in methods of treatment are disclosed.
A new strategy, a transient homocoupling dimer strategy, for direct catalytic oxidative cross-enolate coupling reactions is developed. Cross-enolate coupling products bearing a (contiguous) tetrasubstituted carbon center were obtained chemoselectively without the need for stoichiometric amounts of strong bases/metal oxidants, and thus, the present catalysis provides a general method for the synthesis
Copper-catalyzed aerobic asymmetric cross-dehydrogenative coupling of C(sp<sup>3</sup>)–H bonds driven by visible light
作者:Kexu Zhou、Ying Yu、Yu-Mei Lin、Yanjun Li、Lei Gong
DOI:10.1039/d0gc00262c
日期:——
Asymmetric cross-dehydrogenative coupling (CDC) of C(sp3)–H bonds shows great potential for rapid and stereoselective construction of C–Cbonds and use of molecular oxygen as the oxidant for such transformations is appealing in the context of green synthetic methodologies. However, the poor reactivity of oxygen at the ground state and the challenges in controlling the stereochemistry make it extremely