Facile Borylation of Alkenes, Alkynes, Imines, Arenes and Heteroarenes with <i>N</i>‐Heterocyclic Carbene‐Boranes and a Heterogeneous Semiconductor Photocatalyst
作者:Fukai Xie、Zhan Mao、Dennis P. Curran、Hongliang Liang、Wen Dai
DOI:10.1002/anie.202306846
日期:2023.9.25
In this article, we describe a stable semiconductor material, ultrathin CdS nanosheets, can act as a heterogeneous visible-light photoredox catalyst to orchestrate oxidative and reductive interfacial electron transfers for borylation of assorted alkenes, alkynes, imines and aromatic rings with NHC-borane. The low-cost and easily prepared CdS catalyst can be recovered and reused for several runs with
Sphingomyelin synthase (SMS), which catalyzes ceramide as one of the substrates to produce sphingomyelin, is a critical factor in the sphingolipid biosynthesis pathway. Recent studies indicated that SMS could serve as a novel potential drug target for the treatment of various metabolic diseases such as insulin resistance and atherosclerosis. However, very few small-molecule inhibitors of SMS are known. In this study, we performed structure-based virtual screening in combination with chemical synthesis and bioassay and discovered a class of small-molecule SMS inhibitors. The most potent compound exhibited an IC50 value lower than 20 mu M in an in vitro enzymatic assay. To the best of our knowledge, this is the first time that small-molecule SMS inhibitors with potency close to the micromolar range are publicly revealed. The structure-activity relationship demonstrated by this class of compounds provides insights into the structural features that are essential for effective SMS inhibition. (C) 2013 Elsevier Masson SAS. All rights reserved.
Product-Catalyzed Addition of Alkyl Nitriles to Unactivated Imines Promoted by Sodium Aryloxide/Ethyl(trimethylsilyl)acetate (ETSA) Combination
The first transition-metal-free addition of alkyl nitriles to unactivated irnines was developed using a catalytic combination of 4-MeOC6H4CNa and TMSCH2CO2Et to promote the reaction. The corresponding beta-amino nitriles are obtained in good to almost quantitative isolated yields under mild conditions. A mechanism involving an autocatalytic pathway is proposed on the basis of experimental observations.