Guanidine–Copper Complex Catalyzed Allylic Borylation for the Enantioconvergent Synthesis of Tertiary Cyclic Allylboronates
作者:Yicen Ge、Xi‐Yang Cui、Siu Min Tan、Huan Jiang、Jingyun Ren、Nicholas Lee、Richmond Lee、Choon‐Hong Tan
DOI:10.1002/anie.201813490
日期:2019.2.18
allylboronates from racemic allylic bromides was achieved by using a guanidine–copper catalyst. The allylboronates were obtained with high γ/α regioselectivities (up to 99:1) and enantioselectivities (up to 99 % ee), and could be further transformed into diverse functionalized allylic compounds without erosion of optical purity. Experimental and DFT mechanistic studies support an SN2′ borylation process
通过使用胍-铜催化剂,由外消旋烯丙基溴对映体合成手性环状烯丙基硼酸酯。获得的烯丙基硼酸酯具有高的γ/α区域选择性(高达99:1)和对映选择性(高达99%ee),并且可以进一步转化为多种功能化的烯丙基化合物,而不会降低光学纯度。实验和DFT机理研究支持单齿胍-铜(I)配合物催化的S N 2'硼化过程,该过程通过特殊的直接对映体转化机理进行。
Palladium-Catalyzed Asymmetric Synthesis of Allylic Fluorides
作者:Matthew H. Katcher、Abigail G. Doyle
DOI:10.1021/ja109120n
日期:2010.12.15
The enantioselective fluorination of readily available cyclic allylic chlorides with AgF has been accomplished using a Pd(0) catalyst and Trost bisphosphine ligand. The reactions proceed with unprecedented ease of operation for Pd-mediated nucleophilic fluorination, allowing access to highly enantioenriched cyclic allylicfluorides that bear diverse functional groups. Evidence that supports a mechanism
Synthesis, Structure–Activity Relationships, and In Vivo Evaluation of Novel Tetrahydropyran-Based Thiodisaccharide Mimics as Galectin-3 Inhibitors
作者:Li Xu、Richard A. Hartz、Brett R. Beno、Kaushik Ghosh、Jinal K. Shukla、Amit Kumar、Dipal Patel、Narasimharaju Kalidindi、Nadine Lemos、Shashyendra Singh Gautam、Anoop Kumar、Bruce A. Ellsworth、Devang Shah、Harinath Sale、Dong Cheng、Alicia Regueiro-Ren
DOI:10.1021/acs.jmedchem.0c02001
日期:2021.5.27
or galactose-based derivatives, have the potential to be valuable disease-modifying agents. In our efforts to identify novel galectin-3 disaccharide mimics to improve drug-like properties, we found that one of the monosaccharide subunits can be replaced with a suitably functionalized tetrahydropyran ring. Optimization of the structure–activityrelationships around the tetrahydropyran-based scaffold
[EN] CHOLINE METABOLISM INHIBITORS<br/>[FR] INHIBITEURS DU MÉTABOLISME DE LA CHOLINE
申请人:HARVARD COLLEGE
公开号:WO2020117942A1
公开(公告)日:2020-06-11
The present disclosure relates to compounds, compositions and methods for inhibiting choline metabolism, e.g., conversion of choline to trimethylamine. Disclosed herein are compounds, compositions, and methods for inhibiting choline metabolism, e.g., conversion of choline to TMA. Also disclosed herein are compounds, methods and compositions for inhibiting choline metabolism by gut microbiota resulting in reduction in the formation of trimethylamine (TMA) and trimethylamine N-oxide (TMAO).
Discovery of a Cyclic Choline Analog That Inhibits Anaerobic Choline Metabolism by Human Gut Bacteria
作者:Maud Bollenbach、Manuel Ortega、Marina Orman、Catherine L. Drennan、Emily P. Balskus
DOI:10.1021/acsmedchemlett.0c00005
日期:2020.10.8
conversion of choline to trimethylamine (TMA) by the human gut microbiota has been linked to multiple human diseases. The potential impact of this microbial metabolic activity on host health has inspired multiple efforts to identify small molecule inhibitors. Here, we use information about the structure and mechanism of the bacterial enzyme choline TMA-lyase (CutC) to develop a cyclic cholineanalog that inhibits