Azaarene cis-dihydrodiol-derived 2,2′-bipyridine ligands for asymmetric allylic oxidation and cyclopropanation
作者:Derek R. Boyd、Narain D. Sharma、Lenuta Sbircea、Deirdre Murphy、Tayeb Belhocine、John F. Malone、Stuart L. James、Christopher C. R. Allen、John T. G. Hamilton
DOI:10.1039/b814678k
日期:——
Biphenyl dioxygenase-catalysed cis-dihydroxylation of 2-chloroquinoline, 2-chloro-3-methylquinoline and 2-chloro-6-phenylpyridine substrates yielded the corresponding enantiopure cis-dihydrodiols; enantiopure 2,2â²-bipyridines, synthesised in four steps from 2-chloroquinoline, proved to be efficient chiral ligands in catalytic asymmetric allylic oxidation and cyclopropanation reactions of alkenes.
Asymmetric Cyclopropanation of Styrenes Catalyzed by Metal Complexes of <i>D</i><sub>2</sub>-Symmetrical Chiral Porphyrin: Superiority of Cobalt over Iron
作者:Ying Chen、X. Peter Zhang
DOI:10.1021/jo070997p
日期:2007.7.1
The cobalt(II) complex of D2-symmetric chiral porphyrin [Co(1)] is an effective catalyst for highly diastereoselective and enantioselective cyclopropanation of a broad range of styrene derivatives under mild conditions. Dimerization of diazo compounds, a common side reaction in metal-mediated carbene transfer processes, is minimized in a cobalt porphyrin-based system, obviating the need to employ excess
D 2对称手性卟啉[Co(1)]的钴(II)配合物是在温和条件下对多种苯乙烯衍生物进行高度非对映选择性和对映选择性环丙烷化的有效催化剂。在基于钴卟啉的体系中,重氮化合物的二聚反应(在金属介导的卡宾转移过程中常见的副反应)被最小化,从而避免了使用过量底物和缓慢添加重氮化合物的需求。[Co(1)]的高催化活性和选择性显然是由于钴离子和手性卟啉1的适当组合,因为使用了具有相同配体[Fe(1)的铁(III)配合物)Cl]以低收率和差的对映选择性提供所需的环丙烷产物。
Synthesis of a New Chiral Nonracemic <i>C</i><sub>2</sub>-Symmetric 2,2‘-Bipyridyl Ligand and Its Application in Copper(I)-Catalyzed Enantioselective Cyclopropanation Reactions
作者:Michael P. A. Lyle、Peter D. Wilson
DOI:10.1021/ol049853c
日期:2004.3.1
synthesis of a low molecular weight, chiral nonracemic and C(2)-symmetric bipyridyl ligand is reported. The ligand was prepared using a catalytic asymmetric dihydroxylation reaction of a pyrindine as a key step. The ligand was evaluated in the asymmetric copper(I)-catalyzed cyclopropanation reactions of a series of alkenes and diazoesters. Very high diastereoselectivities and enantioselectivities were
Enantioselective synthesis of tranylcypromine analogues as lysine demethylase (LSD1) inhibitors
作者:Hanae Benelkebir、Christopher Hodgkinson、Patrick J. Duriez、Annette L. Hayden、Rosemary A. Bulleid、Simon J. Crabb、Graham Packham、A. Ganesan
DOI:10.1016/j.bmc.2011.02.017
日期:2011.6
Asymmetric cyclopropanation of styrenes by tert-butyl diazoacetate followed by esterhydrolysis and Curtius rearrangement gave a series of tranylcypromine analogues as single enantiomers. The o,- m- and p-bromo analogues were all more active than tranylcypromine in a LSD1 enzyme assay. The m- and p-bromo analogues were micromolar growth inhibitors of the LNCaP prostate cancer cell line as were the