Bulky Selenium Ligand Stabilized
<i>Trans</i>
‐Palladium Dichloride Complexes as Catalyst for Silver‐Free Decarboxylative Coupling of Coumarin‐3‐Carboxylic Acids
作者:Neha Meena、Sunil Kumar、Vikki N. Shinde、S. Rajagopala Reddy、Himanshi、Nattamai Bhuvanesh、Anil Kumar、Hemant Joshi
DOI:10.1002/asia.202101199
日期:2022.2
chlorine atom through Cl−Pd−Cl rotor. The coalescence of proton signals at elevated temperatures shows selenium inversion in the molecular rotors. The molecular rotors showed excellent efficiency as catalyst for decarboxylative Heck-coupling reaction.
Palladium-Catalyzed Decarboxylative Cross-Coupling Reactions: A Route for Regioselective Functionalization of Coumarins
作者:Farnaz Jafarpour、Samaneh Zarei、Mina Barzegar Amiri Olia、Nafiseh Jalalimanesh、Soraya Rahiminejadan
DOI:10.1021/jo302778d
日期:2013.4.5
A straightforward, regioselective, and step-economical ligand-free palladium-catalyzed decarboxylative functionalization of coumarin-3-carboxylic acids is devised. This protocol is compatible with a wide variety of electron-donating and -withdrawing substituents and allows for construction of various biologically important π-electron extended coumarins.
Synthesis of 6<i>H</i>-Dibenzo[<i>b</i>,<i>d</i>]pyran-6-ones Using the Inverse Electron Demand Diels–Alder Reaction
作者:Ian R. Pottie、Penchal Reddy Nandaluru、Wendy L. Benoit、David O. Miller、Louise N. Dawe、Graham J. Bodwell
DOI:10.1021/jo201775e
日期:2011.11.4
These dienes reacted with the enamine derived from cyclopentanone and pyrrolidine to afford the corresponding cyclopenteno-fused 6H-dibenzo[b,d]pyran-6-ones, most likely via a domino inverseelectrondemandDiels–Alder (IEDDA)/elimination/transfer hydrogenation sequence. The parent diene (EWG = CO2Me, no substituents) was reacted with a range of electron-rich dienophiles (mostly enamines) to afford
合成了一组香豆素稠合的缺电子的1,3-二烯,它们在二烯单元末端的吸电子基团(EWG)的性质不同(当EWG = CO 2 Me时),其性质和取代基的位置。这些二烯与衍生自环戊酮和吡咯烷的烯胺反应,生成相应的环戊烯稠合的6 H-二苯并[ b,d ]吡喃-6-酮,很可能是通过多米诺逆电子需求Diels-Alder(IEDDA)/消除/转移加氢顺序。使母体二烯(EWG = CO 2 Me,无取代基)与一系列富电子的亲二烯体(主要是烯胺)反应,得到相应的6 H-二苯并[ b],d ] pyran-6-ones或它们的未脱氢前体,用合适的氧化剂处理后会被芳香化。烯胺可以在反应之前合成或就地产生。报道了30种二苯并吡喃酮的合成。