Chiral Ligands in Hypervalent Iodine Compounds: Synthesis and Structures of Binaphthyl‐Based λ
<sup>3</sup>
‐Iodanes
作者:Huaiyuan Zhang、Rodrigo A. Cormanich、Thomas Wirth
DOI:10.1002/chem.202103623
日期:2022.1.24
Contained chirality: Novel binaphthyl-based chiralhypervalentiodine(III) reagents are presented with the chirality contained only in the ligand. These have been characterized by X-ray analysis, and all derivatives show the prominent reactivities of hypervalentiodine reagents. Due to their limited stability in solution, they are inefficient chiraliodine(III) derivatives.
包含手性:新型基于联萘的手性高价碘(III)试剂具有仅包含在配体中的手性。这些已通过 X 射线分析进行了表征,并且所有衍生物都显示出高价碘试剂的突出反应性。由于它们在溶液中的稳定性有限,它们是低效的手性碘 (III) 衍生物。
Chiral<i>N</i>,<i>N</i>′-dioxide–iron(<scp>iii</scp>)-catalyzed asymmetric sulfoxidation with hydrogen peroxide
enantioselective sulfoxidation of various sulfides has been achieved by a N,N'-dioxide-iron(iii) complex with 35% aq. H2O2 as the oxidant. The utility of the current method was demonstrated by asymmetric gram-scale synthesis of drug molecule (R)-modafinil. Moreover, a possible working mode was provided to elucidate the chiral induction.
The biocatalytic enantioselective oxidation of prochiral sulfides in the presence of a fungal unspecific peroxygenase from Agrocybe aegerita and hydrogen peroxide as oxidant was investigated. The synthesis of differently substituted (R)‐aryl alkyl sulfoxides was achieved with up to > 99 % conversion and > 99 % ee.