Understanding Halide Counterion Effects in Enantioselective Ruthenium-Catalyzed Carbonyl (α-Aryl)allylation: Alkynes as Latent Allenes and Trifluoroethanol-Enhanced Turnover in The Conversion of Ethanol to Higher Alcohols via Hydrogen Auto-transfer
作者:Eliezer Ortiz、Jonathan Z. Shezaf、Yu-Hsiang Chang、Théo P. Gonçalves、Kuo-Wei Huang、Michael J. Krische
DOI:10.1021/jacs.1c07857
日期:2021.10.13
preference that defines metal-centered stereogenicity and, therefrom, the enantioselectivity of C−C coupling in ruthenium-catalyzed anti-diastereo- and enantioselective C−C couplings of primary alcohols with 1-aryl-1-propynes to form products of carbonyl anti-(α-aryl)allylation. Computational studies reveal that a non-classical hydrogen bond between iodide and the aldehyde formyl CH bond stabilizes the favored
RuX(CO)(η 3 -C 3 H 5 )(JOSIPHOS)(其中 X = Cl、Br 或 I)的晶体学表征揭示了卤化物依赖性非对映异构体偏好,定义了以金属为中心的立体异构性,并由此定义了钌催化的伯醇与 1-芳基-1-丙炔的反非对映和对映选择性 CC 偶联中的 CC 偶联,形成羰基反-(α-芳基)烯丙基化的产物。计算研究表明,碘化物和醛甲酰基 CH 键之间的非经典氢键稳定了羰基加成所需的过渡态。开发了一种改进的催化系统,该系统采用含碘化物预催化剂 RuI(CO) 3 (η 3 -C 3 H 5 ) 与三氟乙醇结合,实现了以前无法实现的转化,如第一个对映选择性钌催化的 CC 所示乙醇偶联生成高级醇。
Pd-catalyzed cross-electrophile Coupling/C–H alkylation reaction enabled by a mediator generated <i>via</i> C(sp<sup>3</sup>)–H activation
作者:Zhuo Wu、Hang Jiang、Yanghui Zhang
DOI:10.1039/d1sc01731d
日期:——
Transition-metal-catalyzed cross-electrophile C(sp2)–(sp3) coupling and C–H alkylation reactions represent two efficient methods for the incorporation of an alkyl group into aromatic rings. Herein, we report a Pd-catalyzed cascade cross-electrophile coupling and C–H alkylation reaction of 2-iodo-alkoxylarenes with alkylchlorides. Methoxy and benzyloxy groups, which are ubiquitous functional groups
The present invention relates to a β3 adrenergic receptor agonist of formula (I); or a pharmaceutical salt thereof; which is capable of increasing lipolysis and energy expenditure in cells and, therefore, is useful, e.g., for treating Type 2 diabetes and/or obesity.
The present invention relates to a &bgr;
3
adrenergic receptor agonist of formula (I) or a pharmaceutical salt thereof, which is capable of increasing lipolysis and energy expenditure in cells and, therefore, is useful for treating Type II diabetes and/or obesity. The compound can also be used to lower triglyceride levels and cholesterol levels or raise high density lipoprotein levels or to decrease gut motility. In addition, the compound can be used to reduced neurogenic inflammation or as an antidepressant agent. Compositions and methods for the use of the compounds in the treatment of diabetes and obesity and for lowering triglyceride levels and cholesterol levels or raising high density lipoprotein levels or for decreasing gut motility are also disclosed.
The present invention relates to a β3 adrenergic receptor agonist of formula (I); or a pharmaceutical salt thereof; which is capable of increasing lipolysis and energy expenditure in cells and, therefore, is useful, e.g., for treating Type 2 diabetes and/or obesity