Chiral 3d-transition metal catalysts on the basis of novel tetradentate bis(iminoalkoxid) ligands and their investigation in the asymmetric catalysis of multiple bond transformations (epoxidation, alkynylation of ketones)

对于制药工业，获得对映体纯的产物是非常有意义的，因为通常只有一种对映体显示出相应的药理学作用。因此，手性分子的对映选择性合成是研究热点。实现这一点的一种方法是通过使用手性催化剂。有了它们，可以进行原子有效的合成，从而避免浪费。因此，本研究计划应开发新型手性四齿双（亚氨基醇）配体的不对称催化剂。首先，应合成具有3d过渡金属（钛、铬、锰、铁、铜、锌）的不同络合物。此外，应尝试合成双金属配合物，因为这些配合物由于协同效应而具有更好的催化性能。配合物的性质应在多重键转换（酮的环氧化、炔基化）的不对称催化中进行测试。通过改变配体的取代基，催化剂应该得到优化，以实现高的对映体过量。总的来说，应该开发一种廉价且高度可变的手性配体系统，该系统易于合成，并且其络合物能够与已建立的salen络合物竞争催化。

For the pharmaceutical industry, it is of great interest to obtain enantiomerically pure products, since normally only one enantiomer shows the corresponding pharmacological effect. Accordingly, the enantioselective synthesis of chiral molecules is subject of intense research. One way to accomplish this is through the use of chiral catalysts. With them it is possible to perform atom efficient synthesis and thus avoid waste. This is both economically and ecologically wise.Therefore, asymmetric catalysts with novel chiral, tetradentate bis(iminoalcohol) ligands should be developed in this research project. Initially, different complexes with 3d transition metals (titanium, chromium, manganese, iron, copper, zinc) should be synthesized. In addition the synthesis of bimetallic complexes should be tried, since these could have better catalytic properties due to cooperative effects. The properties of the complexes should be tested in the asymmetric catalysis of multiple bond transformations (epoxidation, alkynylation of ketones). By varying the substituents of the ligand, the catalysts should get optimized to achieve high enantiomeric excesses. Overall, an inexpensive and highly variable, chiral ligand system should be developed that is easy to synthesize and its complexes are able to compete in catalysis with the established salen complexes.