Reduction of Activated Alkenes by P
<sup>III</sup>
/P
<sup>V</sup>
Redox Cycling Catalysis
作者:Lars Longwitz、Thomas Werner
DOI:10.1002/anie.201912991
日期:2020.2.10
using a phosphetane oxide catalyst in the presence of a simple organosilane as the terminal reductant and water as the hydrogen source. Quantitative hydrogenation was observed when 1.0 mol % of a methyl‐substituted phosphetane oxide was employed as the catalyst. The procedure is highly selective towards activated double bonds, tolerating a variety of functional groups that are usually prone to reduction
Studies of hydrogen isotope scrambling during the dehalogenation of aromatic chloro‐compounds with deuterium gas over palladium catalysts
作者:William J.S. Lockley、Niccolò A. E. Venanzi、Georgie J. Crane
DOI:10.1002/jlcr.3878
日期:2020.11
catalyst with one prepared in situ by reduction of palladium trifluoroacetate with deuterium gas and dispersed upon micronised polytetrafluoroethylene led to much reduced scrambling (typically 0–6% compared with up to 40% for palladium on carbon) and to high atom% abundance, regiospecific labelling. The improved catalytic system now enables efficient polydeuteration via the dehalogenation of polyhalogenated
使用同位素氢气对芳族卤化物进行催化脱卤是标记药物、生物化学品、环境试剂等的重要策略。为了扩展、改进和进一步了解这一过程,在四氢呋喃溶液中使用氘气和钯碳催化剂对模型芳基氯进行催化氘代脱卤过程中,对氘同位素与氚的扰乱进行了研究。富电子氯芳烃环的加扰程度最大。四氢呋喃溶剂和三乙胺碱不是不想要的朊的来源;相反,它主要来自催化剂的水含量,尽管其他来源的朊也可能存在于催化剂上。用一种制备的催化剂代替 Pd/C 催化剂通过用氘气原位还原三氟乙酸钯并分散在微粉化聚四氟乙烯上,可显着减少乱序(通常为 0-6%,而碳载钯最高可达 40%)和高原子百分比丰度,区域特异性标记。改进后的催化系统现在可以通过多卤化前体的脱卤实现高效的多氘化,使该过程可用于制备 MS 内标,并可能用于高比活性氚标记。
Comparison of Copper(II) Acetate Promoted N-Arylation of 5,5-Dimethyl Hydantoin and Other Imides with Triarylbismuthanes and Aryl Boronic Acids
作者:Helmut Hügel、Colin Rix、Karin Fleck
DOI:10.1055/s-2006-949638
日期:2006.9
This work demonstrates that the copper acetate promoted N-arylation of imides with boronic acids can be employed as a major method for the synthesis of N3-aryl hydantoins.
这项工作表明,使用乙酸铜促进的亚胺与硼酸的N-芳基化反应可以作为合成N3-芳基海因的主要方法。
Diaryliodonium Salts. IX. The Synthesis of Substituted Diphenyliodonium Salts<sup>1</sup>
作者:F. Marshall Beringer、Robert A. Falk、Marilyn Karniol、Irving Lillien、Giulio Masullo、Marvin Mausner、Erwin Sommer
DOI:10.1021/ja01511a020
日期:1959.1
New Derivatives of N-Hydroxybutanamide: Preparation, MMP Inhibition, Cytotoxicity, and Antitumor Activity
HepG2. The iodoaniline derivative was also slightly toxic to glioma cell lines A-172 and U-251 MG. Non-cancerous FetMSC and Vero cells were found to be the least sensitive to all the compounds. In vivo studies demonstrated that the iodoaniline derivative of N1-hydroxy-N4-phenylbutanediamide had low acute toxicity. In a mouse model of B16 melanoma, this compound showed both antitumor and antimetastatic