The first intramolecular enantioselective cyclopropanation of indenes and trisubstituted alkenes was accomplished by using new chiral phosphine X5 derived gold(I) complexes. This reaction is a straightforward, efficient method for constructing [5–3–6] fused-ring compounds with two vicinal all-carbon quaternary stereogenic centers, a core structure shared by numerous pharmacological products, and bioactive
Thiete Dioxides as Templates Towards Twisted Scaffolds and Macrocyclic Structures
作者:Andreas N. Baumann、Felix Reiners、Alexander F. Siegle、Peter Mayer、Oliver Trapp、Dorian Didier
DOI:10.1002/chem.201905751
日期:2020.5.12
Thiete dioxide units have been employed as a template for further functionalization through C-H activation strategies. Using simple thiete dioxide building blocks, a new library of axially chiral molecules has been synthesized that owe their stability to electrostatic interactions in the solid state. Similar starting materials were further engaged in the formation of cyclic trimeric structures, opening
Some new spirocycles of pentacoordinated antimony are described. By means of the temperature-dependent proton-resonance spectra of the antimony penta- organyls (XXXV) and (XXXVI) conclusions concerning the dynamic stereochemistry of these derivatives are possible. The cyclic stibines, essential for the synthesis of the pentavalent antimony derivatives, are prepared by a new method with the aid of bidentate
The highly enantioselective copper-catalyzed three-component boroacylation of 1,1-disubstituted allenes is reported by using a class of chiral ligands (WJ-Phos), delivering various functionalized organoboron compounds bearing an all-carbon stereocenter in moderate to good yields with high enantioselectivities. WJ-Phos is a ferrocene-derived chiral sulfinamide phosphine ligand and can be easily synthesized