Synthesis of Aryl Ethers from Aromatic Carboxylic Acids
作者:Lukas Gooßen、Sukalyan Bhadra、Wojciech Dzik
DOI:10.1055/s-0033-1339470
日期:——
meta-substituted carboxylates are converted into para-substituted alkoxyarenes and vice versa. The combined processes provide a convenient synthetic entry to the important class of aromatic ethers from widely available carboxylicacids. A silver/copper bimetallic catalyst system promotes the decarboxylative Chan–Evans–Lam alkoxylation of ortho-substituted aromatic carboxylate salts with tetraalkyl orthosilicates
mild and highly selective protocol for the monodeuteration of a variety of arenes and heteroarenes is presented. Catalytic amounts of Ag(I) salts in DMSO/D2O are shown to facilitate the deutero-decarboxylation of ortho-substituted benzoic and heteroaromatic α-carboxylic acids in high yields with excellent levels of deuterium incorporation.
提出了一种实用,温和且高度选择性的方案,用于多种芳烃和杂芳烃的单氘化。催化量的Ag(I)盐在二甲基亚砜已显示出/ D 2 O以高收率和良好的氘掺入水平促进了邻位取代的苯甲酸和杂芳族α-羧酸的氘代脱羧。
The disclosure relates to xanthene derivatives which possess analgesic activity, to processes for the manufacture of said derivatives and to pharmaceutical compositions containing them. Typical of the xanthene derivatives disclosed is 6-chloro-4-hydroxy-1'-methylxanthene-9-spiro-4'-piperidine.
Gold(I) salts are found to mediate the decarboxylation of a variety of aromatic and heteroaromatic carboxylicacids at significatively lower temperatures (as low as 60 °C) than the currently used copper(I) (180–190 °C) and silver(I) (80–140 °C) systems. In contrast to silver(I)‐ and copper(I)‐mediated decarboxylations, the resulting aryl‐gold(I) complexes are stable towards protodemetallation and can
Nonsteroidal Hypocholesteremic Agents. I. The Synthesis and Serum Sterol Lowering Properties of Substituted 4-(2-Dialkylaminoethoxy)diphenylamines and Related Compounds
作者:Frederick L. Bach、John C. Barclay、Elliott. Cohen