MnIII-Promoted synthesis of functionalized γ-lactones in acetic and formic acids
摘要:
The yield of substituted gamma-lactones obtained by Mn-III-mediated addition of potassium monomethyl malonate on cinnamate esters can be optimized by performing the reaction either in acetic or in formic acid depending on the substrate. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.
[EN] METHOD FOR PREPARING INTERMEDIATE OF 4-METHOXYPYRROLE DERIVATIVE<br/>[FR] PROCÉDÉ DE PRÉPARATION D'INTERMÉDIAIRE DE DÉRIVÉ DE 4-MÉTHOXYPYRROLE
申请人:DAE WOONG PHARMA
公开号:WO2018236153A1
公开(公告)日:2018-12-27
The present invention relates to a.method for preparing intermediates of 4- methoxypyrrole derivatives. The preparation method according to the present invention has advantages that the production cost can be lowered by using inexpensive starting materials, a high-temperature reaction is not required as a whole, inexpensive and non-explosive reagents are used instead of (trimethylsilyl)diazomethane, and further an intermediate of 4-methoxypyrrole derivatives can be prepared as a whole at a high yield.
Access to β-Keto Esters by Palladium-Catalyzed Carbonylative Coupling of Aryl Halides with Monoester Potassium Malonates
作者:Signe Korsager、Dennis U. Nielsen、Rolf H. Taaning、Troels Skrydstrup
DOI:10.1002/anie.201304072
日期:2013.9.9
New tricks for an old dog: The Pd‐catalyzed carbonylative α‐arylation of monoethyl potassiummalonates with aryl bromides and reactive aryl chlorides provides a simple and direct route to aryl β‐ketoesters. Because only stoichiometric amounts of carbon monoxide are employed, the method is ideal for the introduction of carbon isotopes into more complex structures.
The present description relates to fused polycyclic 2-pyridinone compounds and forms and pharmaceutical compositions thereof and methods of using such compounds, forms or compositions thereof for treating or ameliorating a wild-type or drug-resistant form of N. gonorrhoeae or N. meningitides. A compound of Formula (la), Formula (lb) or Formula (Ic), or a form thereof, wherein the dashed lines represent one or more double bonds optionally present where allowed by available valences.
<i>trans</i>-Directing Ability of the Amide Group: Enabling the Enantiocontrol in the Synthesis of 1,1-Dicarboxy Cyclopropanes. Reaction Development, Scope, and Synthetic Applications
作者:David Marcoux、Sébastien R. Goudreau、André B. Charette
DOI:10.1021/jo902066y
日期:2009.12.4
enantioselective formation of 1,1-cyclopropane diesters via the metal-catalyzed cyclopropanation of olefins. The strategies envisioned to achieve such a goal are discussed as well as the results that led us to the discovery of the powerful trans-directingability of the amidegroup in Rh(II)-catalyzed cyclopropanation reactions. We show how this feature enables a solution for the stereoselective synthesis
Synthesis of α-Aryl Nitriles through Palladium-Catalyzed Decarboxylative Coupling of Cyanoacetate Salts with Aryl Halides and Triflates
作者:Rui Shang、Dong-Sheng Ji、Ling Chu、Yao Fu、Lei Liu
DOI:10.1002/anie.201006763
日期:2011.5.2
Worth its salt: The palladium‐catalyzed decarboxylativecoupling of the cyanoacetate salt as well as its mono‐ and disubstituted derivatives with aryl chlorides, bromides, and triflates is described (see scheme). This reaction is potentially useful for the preparation of a diverse array of α‐arylnitriles and has good functional group tolerance. S‐Phos=2‐(2,6‐dimethoxybiphenyl)dicyclohexylphosphine)