Three's a crowd: The combination of a Brønstedacid and a hydrogen‐bond donor cocatalyst was found to promote various ionic [2+4] cycloadditions under mild reaction conditions (see scheme; Ts=4‐toluenesulfonyl). Thiophosphoramides are the most effective cocatalysts because of the stronger counterion activation effect resulting from three, rather than two, hydrogen bonds involved in anion binding.
Compounds having the following formula (I) and methods of their use and preparation are disclosed:
公开具有以下式(I)的化合物及其使用和制备方法:
Tank-binding kinase inhibitor compounds
申请人:Gilead Sciences, Inc.
公开号:US10259811B2
公开(公告)日:2019-04-16
Compounds having the following formula (I) and methods of their use and preparation are disclosed:
公开了具有下式(I)的化合物及其使用和制备方法:
Highly Selective Hydrogenation of C═C Bonds Catalyzed by a Rhodium Hydride
作者:Yiting Gu、Jack R. Norton、Farbod Salahi、Vladislav G. Lisnyak、Zhiyao Zhou、Scott A. Snyder
DOI:10.1021/jacs.1c04683
日期:2021.6.30
Undermildconditions (room temperature, 80 psi of H2) Cp*Rh(2-(2-pyridyl)phenyl)H catalyzes the selectivehydrogenation of the C═C bond in α,β-unsaturated carbonyl compounds, including natural product precursors with bulky substituents in the β position and substrates possessing an array of additional functionalgroups. It also catalyzes the hydrogenation of many isolated double bonds. Mechanistic
在温和条件下(室温,80 psi H 2)Cp*Rh(2-(2-吡啶基)苯基)H催化α,β-不饱和羰基化合物(包括天然产物前体)中C=C键的选择性氢化在 β 位具有庞大的取代基,并且底物具有一系列额外的官能团。它还催化许多分离的双键的氢化。机理研究表明,不涉及自由基中间体,并且催化剂似乎是均相的,从而为类似氢化过程的现有方案提供了重要的互补性。
Synthesis of Functionalized Cyclopentenecarboxaldehydes
作者:S. Canonica、M. Ferrari、G. Jommi、M. Sisti
DOI:10.1055/s-1988-27674
日期:——
Ozonolysis of the ethylene acetals of 2-substituted 2-cyclohexenones followed by cyclization of the intermediate 1,6-dicarbonyl compounds affords 6-substituted 7-formyl-1,4-dioxaspiro[4,4]non-6-enes in modest yields. The same procedure applied to protected 2-substituted 2-cyclohexenols gives 2-substituted 3-formyl-2-cyclopentenyl 2-methoxyethoxymethyl ethers in satisfactory yields.