mono-substituted acetophenones are in reasonable correlation with the σ-Hammett coefficients of the substitutedphenyl groups. Variations of the substrate transformation rates are hence mainly caused by mesomeric and inductive effects of the substituents, while differences in substrate binding have a secondary relevance. Some substrate 1H NMR chemicalshifts and carbonyl IR absorption bands are in reasonable
细念珠菌木糖还原酶催化单取代苯乙酮还原的催化效率与取代苯基的σ -Hammett系数合理相关。因此,底物转化率的变化主要是由取代基的介观效应和诱导效应引起的,而底物结合的差异具有次要相关性。一些底物1 H NMR 化学位移和羰基 IR 吸收带与催化活性是合理的,可以以良好的准确度估计转化率。生成的取代的 ( S )-1-苯基乙醇以非常高的对映体过量产生。
Selective C‐alkylation Between Alcohols Catalyzed by N‐Heterocyclic Carbene Molybdenum
作者:Jiahao Liu、Weikang Li、Yinwu Li、Yan Liu、Zhuofeng Ke
DOI:10.1002/asia.202100959
日期:2021.10.18
The first molybdenum-catalyzed C-alkylation between alcohols via borrowing hydrogen is reported.
Transfer Hydrogenation of Ketones and Imines with Methanol under Base-Free Conditions Catalyzed by an Anionic Metal–Ligand Bifunctional Iridium Catalyst
作者:Rongzhou Wang、Xingyou Han、Jing Xu、Peng Liu、Feng Li
DOI:10.1021/acs.joc.9b02957
日期:2020.2.21
An anionic iridium complex [Cp*Ir(2,2'-bpyO)(OH)][Na] was found to be a general and highly efficient catalyst for transfer hydrogenation of ketones and imines with methanol under base-free conditions. Readily reducible or labile substituents, such as nitro, cyano, and ester groups, were tolerated under present reaction conditions. Notably, this study exhibits the unique potential of anionic metal-ligand
Bioreduction of Acetophenone Derivatives by Red Marine Algae Bostrychia radicans and B. tenella, and Marine Bacteria Associated
作者:Ana M. Mouad、Mariana P. Martins、Hosana M. Debonsi、Ana L. L. de Oliveira、Rafael de Felicio、Nair S. Yokoya、Mutue T. Fujii、Claúdia B. A. de Menezes、Fabiana Fantinatti-Garboggini、André L. M. Porto
DOI:10.1002/hlca.201000434
日期:2011.8
biocatalytic reduction of acetophenone derivatives was exploited by using algal biomass from Bostrychia radicans and B. tenella producing exclusively (S)‐2‐phenylethanols with high enantiomeric excess (>99% ee). Bacterial populations associated with algal biomass were identified as the Bacillus genus. This report deals with the first investigations involving the use of marine bacteria associated with B. radicans