of silyl substituents in diphenylprolinolsilylether catalysts was investigated. Mechanistically, reactionscatalyzed by diphenylprolinolsilylether can be categorized into three types: two that involve an iminium ion intermediate, such as for the Michael‐type reaction (type A) and the cycloaddition reaction (type B), and one that proceeds via an enamine intermediate (type C). In the Michael‐type
Chiral bicyclo[3.3.0]octatrienes with excellent enantioselectivity were synthesized from the simple starting materials of α,β-unsaturated aldehyde and cyclopentadiene via one-pot operation, which consisted of a diphenylprolinol silyl ether-mediated ene-type reaction, intramolecular addition reaction of cyclopentadiene moiety with aldehyde and dehydration reaction.
Titanocene catalysts with modifiable C-symmetric chiral ligands
作者:Stefan Wiesler、Sara L. Younas、Daniel Kratzert、Jan Streuff
DOI:10.1016/j.jorganchem.2020.121327
日期:2020.7
The synthesis of three chiral titanocene dichlorides based on a readily-accessible C2-symmetric tetrahydropentalenyl ligand is described. Two of the complexes are unsymmetrical containing also Cp and Cp* ligands, and one is the symmetriccomplex with two chiral tetrahydropentalenyls. The redox properties of the new titanocenes are investigated by cyclic voltammetry and the catalytic performance in