作者:Jan Felix Scholtes、Oliver Trapp
DOI:10.1002/anie.201901175
日期:2019.5.6
a supramolecular assembly, where the axial orientation of the biphenyl ligand backbone is governed by the chirality of the amino acid moieties. Stereoinduction during catalysis is decoupled from this process and occurs as an immediate consequence of the emergent behavior of the ligands. This supramolecular system is very robust and has the potential to be adopted for other ligand designs in enantioselective
据报道,一类新型的以氨基酸为基础的双酰胺相互作用位点修饰的助熔联苯双亚膦酸酯(BIBIPHOS)配体的设计经历了自发的去对称作用。使用Rh-BIBIPHOS氢化前手性烯烃的对映体比例高达96:4(R / S)。通量BIBIPHOS配体的这种立体收敛行为是由识别位点的明显分子间互锁触发的,导致形成超分子组装体,其中联苯配体主链的轴向方向由氨基酸部分的手性支配。催化过程中的立体诱导与该过程解耦,并且由于配体的出现行为而直接产生。该超分子系统非常坚固,在对映选择性催化中具有被其他配体设计采用的潜力。