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.
Radical Aza-Cyclization of α-Imino-oxy Acids for Synthesis of Alkene-Containing <i>N</i>-Heterocycles via Dual Cobaloxime and Photoredox Catalysis
作者:Jia-Lin Tu、Jia-Li Liu、Wan Tang、Ma Su、Feng Liu
DOI:10.1021/acs.orglett.0c00224
日期:2020.2.7
Nitrogen-containing heterocycles are prevalent in both naturally and synthetically bioactive molecules. We report herein an unprecedented protocol for radical aza-cyclization of α-imino-oxy acids with pendant alkenes via synergistic photoredox and cobaloxime catalysis. With or without alkenes as the intermolecular cross-coupling partners, the transformation provides a variety of corresponding alkene-containing dihydropyrrole
A three-component Minisci reaction coupling of 1,3-dicarbonylcompounds with vinyl ethers and quinolines or isoquinolines under visible light is developed. The 1,3-dicarbonylcompound undergoes single-electron oxidation to afford an electrophilic 1,3-dicarbonyl radical under visible light irradiation. Due to the polarity of the free radical, the electrophilic radical adds to the electron-rich olefin
Aryl and heterocyclyl substituted pyrimidine derivatives as anti-coagulants
申请人:Berlex Laboratories, Inc.
公开号:US06372751B1
公开(公告)日:2002-04-16
This invention is directed to aryl and heterocyclyl substituted pyrimidine derivatives selected from the following formulae:
wherein Z1, Z2, R1, R2, R3, R4, R5 and R6 are defined herein. These compounds are useful as anti-coagulants.
Racemic mixtures of four stereoisomers are easily formed via many fundamental organic transformations, but the direct utilities of these mixtures have been less studied and remain large challenges to date. In this work, we introduce a new method, i.e., divergent dynamic kinetic resolution, to achieve the separation of racemic mixtures of four stereoisomers. The hypothesis was proved by using a N‐heterocyclic