Rhodium(II)-Catalyzed Synthesis of<i>N</i>-Aryl-<i>N′</i>-tosyldiazenes from Primary Aromatic Amines Using (Tosylimino)aryliodinane: A Potent Stable Surrogate for Diazonium Salts
The first example of the single-step synthesis of N-aryl-N'-tosyldiazenes from primary aromaticamines is described. A wide range of aromaticamines provided the corresponding products in high yields via an N−N bond formation with Rh(II)-nitrene intermediates, generated in situ from dirhodium(II) complex catalysts and (tosylimino)-2,4,6-trimethylphenyliodinane (TsN=IMes), followed by oxidation. The
描述了从芳香伯胺一步合成 N-芳基-N'-甲苯磺酰基二氮烯的第一个例子。范围广泛的芳香胺通过与 Rh(II)-硝烯中间体形成 NN 键以高产率提供相应的产物,由二铑 (II) 配合物催化剂和 (tosylimino)-2,4,6- 原位生成三甲基苯基碘烷 (TsN=IMes),然后氧化。合成的 N-芳基-N'-甲苯磺酰基二氮烯已成功证明可作为重氮盐在芳香伯胺的两步脱氨基转化中的有效稳定替代物。
Synthesis and phosphatase inhibitory activity of 3-alkynylestrones and their derivatives
作者:Anton Ivanov、Sebastian Boldt、Zaib un Nisa、Syed Jawad Ali Shah、Peter Ehlers、Alexander Villinger、Gyula Schneider、János Wölfling、Qamar Rahman、Jamshed Iqbal、Peter Langer
DOI:10.1039/c5ra25558a
日期:——
range of 3-alkynylated 3-deoxy-estrones were prepared by Sonogashira reactions and transformed into estrone derived diones and quinoxalines. The alkynylated estrones and their derivatives exhibit significant biological activity as alkaline phosphatase inhibitors. The mode of action was illustrated based on docking studies.
In the presence of a fluoroalkanesulfonyl fluoride and a catalytic amount of bis(triphenylphosphine)palladium dichloride, phenols reacted with triethylammonium formate in triethylamine to give arenes. Similarly, phenols reacted with alkynes or alkenes in triethylamine providing alkynyl- or alkenylarenes, respectively.
Copper-free palladium-catalyzed Sonogashira and Hiyama cross-couplings using aryl imidazol-1-ylsulfonates
作者:Steven J. Shirbin、Berin A. Boughton、Steven C. Zammit、Shannon D. Zanatta、Sebastian M. Marcuccio、Craig A. Hutton、Spencer J. Williams
DOI:10.1016/j.tetlet.2010.03.110
日期:2010.6
Aryl imidazylates are effective electrophilic partners in copper-free palladium-catalyzed Hiyama and Sonogashira cross-coupling reactions. The Sonogashira cross-coupling of estron-3-yl imidazylate afforded the corresponding phenylacetylene derivative in excellent yield. (C) 2010 Elsevier Ltd. All rights reserved.