Evidence that the availability of an allylic hydrogen governs the regioselectivity of the Wacker oxidation
作者:Matthew J. Gaunt、Jinquan Yu、Jonathan B. Spencer
DOI:10.1039/b103066n
日期:——
The allylic hydrogen is found to have a dramatic effect on the
regioselectivity of the Wacker oxidation, leading to the postulation that
an agostic hydrogen or enyl (σ + π) complex helps to stabilise the
key intermediate.
Electrochemical [4+2] Annulation‐Rearrangement‐Aromatization of Styrenes: Synthesis of Naphthalene Derivatives
作者:Yueyue Ma、Jufeng Lv、Chengyu Liu、Xiantong Yao、Guoming Yan、Wei Yu、Jinxing Ye
DOI:10.1002/anie.201902315
日期:2019.5.13
We report the first electrochemical strategy to synthesize functionalized naphthalene derivatives through [4+2] annulation—rearrangement–aromatization from styrenes under mild conditions. The electrolysis does not require metals, oxidants and high valence substrates, indicating the atom and step‐economy ideals. The dehydrodimer produced through [4+2] cycloaddition of 4‐methoxy α‐methyl styrene is isolated
Palladium-Catalyzed Dual Ligand-Enabled Alkylation of Silyl Enol Ether and Enamide under Irradiation: Scope, Mechanism, and Theoretical Elucidation of Hybrid Alkyl Pd(I)-Radical Species
作者:Bin Zhao、Rui Shang、Guang-Zu Wang、Shaohong Wang、Hui Chen、Yao Fu
DOI:10.1021/acscatal.9b04699
日期:2020.1.17
dual ligand effect and the irradiation effect in the catalytic cycle. The reaction is suggested to proceed via a hybrid alkyl Pd(I)-radical species generated by inner-sphere electron transfer of phosphine-coordinated Pd(0) species with alkyl bromide. This intriguing hybrid alkyl Pd(I)-radical species is elucidated by theoretical calculation to be a triplet species coordinated by three phosphine atoms
Catalytic Enantioselective Amination of Enolsilanes Using <i>C</i><i><sub>2</sub></i>-Symmetric Copper(II) Complexes as Chiral Lewis Acids
作者:David A. Evans、Douglas S. Johnson
DOI:10.1021/ol990113r
日期:1999.8.1
[formula: see text] [Cu(S,S)-t-Bu-box](OTf)2 (1) catalyzes the enantioselective amination of enolsilanes with azodicarboxylate derivatives. Isomerically pure enolsilanes of aryl ketones, acylpyrroles, and thioesters added to the azo-imide in greater than 95% ee. The use of an alcohol additive was critical to achieving catalyst turnover.
COMPOSITIONS OF SPHINGOSINE-1-PHOSPHATE RECEPTOR 2 (S1PR2) BINDING AGENTS AND USES THEREOF
申请人:Tu Zhude
公开号:US20200369626A1
公开(公告)日:2020-11-26
Described are compounds for the binding of S1PR2, and imaging agents and pharmaceutical compositions including said compounds. Also described are methods employing the compounds, imaging agents, and pharmaceutical compositions. These methods include imaging and/or treatment of diseases associated with S1PR2.