Convenient Divergent Strategy for the Synthesis of TunePhos-Type Chiral Diphosphine Ligands and Their Applications in Highly Enantioselective Ru-Catalyzed Hydrogenations
作者:Xianfeng Sun、Le Zhou、Wei Li、Xumu Zhang
DOI:10.1021/jo702068w
日期:2008.2.1
convenient, divergent strategy for the synthesis of a series of modular and fine-tunable C3-TunePhos-type chiral diphosphineligands and their applications in highlyefficient Ru-catalyzed asymmetrichydrogenations were explored. Up to 97 and 99% ee values were achieved for the enantioselective synthesis of β-methyl chiral amines and α-hydroxy acid derivatives, respectively.
Matching and Mismatching Effects of Hybrid Chiral Biaxial Bisphosphine Ligands in Enantioselective Hydrogenation of Ketoesters
作者:Xianfeng Sun、Wei Li、Le Zhou、Xumu Zhang
DOI:10.1002/chem.200900722
日期:2009.7.27
Highly enantioselectivehydrogenation reactions provide facile access to optically active α‐ and β‐hydroxy acid derivatives (see scheme), which are very important chiral building blocks for the syntheses of a variety of natural products and biologically active molecules. The selectivity data revealed that the matched ligand system was L*, which afforded much higher enantioselectivities in hydrogenation
Synthesis and enzymatic resolution of novel analogs of alicyclic and heterocyclic mandelic acid derivatives
作者:Bohdan S. Sosunovych、Oleksii S. Timokhin、Olexandr V. Kucher、Nadiia Y. Demianyk、Denys V. Hys、Yelyzaveta A. Zvarych、Oleg B. Smolii、Bohdan V. Vashchenko、Oleksandr O. Grygorenko
DOI:10.1016/j.tet.2024.134068
日期:2024.7
Synthesis and enzymatic resolution of a new class of alicyclic and heterocyclic mandelic acidderivatives was described. The method relied on the preparation of cyanohydrins from the commercially available aldehydes followed by hydrolysis to corresponding racemic hydroxy esters that were used in the resolution with the enzyme. An alternative approach was proposed for compounds that were not suitable