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。
4-Hydroxyacetophenone monooxygenase from Pseudomonas fluorescens ACB as an oxidative biocatalyst in the synthesis of optically active sulfoxides
作者:Gonzalo de Gonzalo、Daniel E. Torres Pazmiño、Gianluca Ottolina、Marco W. Fraaije、Giacomo Carrea
DOI:10.1016/j.tetasy.2005.11.024
日期:2006.1
sulfoxidation reactions on a set of aromatic sulfides. With a few exceptions, excellent enantioselectivities in the synthesis of chiral phenyl and benzyl sulfoxides were achieved. The bacterial Baeyer–Villiger monooxygenase was also shown to accept racemic sulfoxides, a prochiral diketone and an organoboron compound as substrates. This study demonstrates the great biocatalytic potential of this novel oxidative
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.