A Unified Approach to Customized Chiral Carbon-Bridged ansa-Metallocenes.
CHEMISTRY-A EUROPEAN JOURNAL(2018)
摘要
Chiral ansa-metallocenes are privileged catalysts for a range of stereoselective transformations. Their synthesis, however, has remained a tremendous challenge, which has prevented a broad and systematic exploration for applications in synthesis and catalysis. A modular approach to such ansa-metallocenes that enables a facile modification of the ring substitution and the ligand bridge, as well as the introduction of various core metals, is described. The complexes were formed with good rac-selectivity and could be isolated with high purity. The strength of the approach was demonstrated by the synthesis of several new and previously known complexes, including a unique helical chiral ansa-metallocene. Using a chiral ligand, a moderate central-to-planar chirality transfer was observed.
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关键词
helical structures,ligand design,metallocenes,rearrangement,titanium
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