2,2′-Biaryldicarboxylate Synthesis via Electrocatalytic Dehydrogenative C–H/C–H Coupling of Benzoic Acids
作者:Zhongyi Zeng、Jonas F. Goebel、Xianming Liu、Lukas J. Gooßen
DOI:10.1021/acscatal.1c01127
日期:2021.6.4
catalysts. These compounds have been found to be conveniently accessible from benzoicacidsvia Rh-catalyzed electrooxidative C–H/C–H couplings, giving valuable dihydrogen as the byproduct. In an undivided cell with Pt electrodes, RhCl3·3H2O catalyzes the oxidative carboxylate-directed ortho-homocoupling of various aromatic acids with a current efficiency of 67%. The protocol is operationally simple, tolerates
A one-pot transformation of biaryl dicarboxylic acids to (NH)-phenanthridinone derivatives based on a Curtiusrearrangement and subsequent basic hydrolysis was developed. This method is also applicable for the preparation of optically active amide-functionalized [7]helicene-like molecules. Furthermore, aza[5]helicene derivatives with a phosphate moiety were isolated as a product of the Curtius rearrangement
开发了基于 Curtius 重排和随后的碱性水解的联芳基二羧酸向 ( NH )-菲啶酮衍生物的一锅法转化。该方法也适用于光学活性酰胺官能化[7]类螺烯分子的制备。此外,在带有硫属元素原子的底物的情况下,具有磷酸盐部分的氮杂[5]螺烯衍生物被分离为 Curtius 重排步骤的产物。通过 X 射线衍射分析揭示了这些产品的立体结构,表明硫属元素键合和磷元素键合相互作用可能有助于它们的稳定性。进一步研究了类螺烯分子的构型稳定性及其手性。
The Synthesis of Certain Local Anesthetics of the Biphenyl Series
作者:Francis H. Case、Emil Koft
DOI:10.1021/ja01847a042
日期:1941.2
Potential antitumor agents. 58. Synthesis and structure-activity relationships of substituted xanthenone-4-acetic acids active against the colon 38 tumor in vivo
作者:Gordon W. Rewcastle、Graham J. Atwell、Bruce C. Baguley、Stephen B. Calveley、William A. Denny
DOI:10.1021/jm00124a012
日期:1989.4
In a search for compounds related to flavoneacetic acid with activity against solid tumors, a series of methyl-, methoxy-, chloro-, nitro-, and hydroxy-substituted xanthenone-4-acetic acids have been synthesized and evaluated against subcutaneously implanted colon adenocarcinoma 38 in vivo, using a short-term histology assay as a primary screening system. A major goal of this work was to identify compounds with similar profiles of activity to that of flavoneacetic acid but of higher potency. The level of activity of the compounds appeared to depend more on the nature of the substituent than its positioning, in the order Cl greater than Me, OMe greater than NO2, OH. However, the potency of the compounds was related much more to the position rather than the nature of the substitution, with 5-substituted compounds being clearly the most dose potent. 5-Methylxanthenone-4-acetic acid has a similar level of activity to that of flavoneacetic acid in the test systems employed but is more than 7-fold as dose potent.
Braeunling,H. et al., Chemische Berichte, 1967, vol. 100, p. 880 - 888