Palladium-catalyzed selective synthesis of 3,4-dihydroquinazolines from electron-rich arylamines, electron-poor arylamines and glyoxalates
作者:Chao Wu、Jie Wang、Xing-Yu Zhang、Guo-Kai Jia、Zhong Cao、Zilong Tang、Xianyong Yu、Xinhua Xu、Wei-Min He
DOI:10.1039/c8ob01005f
日期:——
synthesis of structurally diverse 3,4-dihydroquinazolines from electron-rich arylamines, electron-poor arylamines and glyoxalates has been developed under mild conditions. This reaction is carried out in a tandem manner constituted by the condensation of arylamines and glyoxalates, the selective Diels–Alder cycloaddition and oxidation processes, in which 4-nitrothiophenol was used as the key ligand.
Modular Synthesis of Chiral NHC Precursors and Their Silver and Gold Complexes
作者:Zita Szabo、Matyas Timari、Rudolf Kassai、Bianka Szokol、Attila C. Benyei、Tamás Gáti、Attila Paczal、Andras Kotschy
DOI:10.1021/acs.organomet.0c00530
日期:2020.10.12
stereoselective synthesis of chiral heterocyclic carbene precursors and the structural features of their silver and gold complexes were investigated. The prepared compounds are all based on the imidazolidine scaffold and bear the bulky tert-butyl substituent on the backbone in a stereocontrolled manner. The majority of the synthesized carbene precursors carry an additional element of central chirality in the
Catalyst-free tandem aldol condensation/Michael addition of 1,3-cyclohexanediones with enolizable aldehydes
作者:Kerstin Rohr、Rainer Mahrwald
DOI:10.1016/j.bmcl.2009.03.040
日期:2009.7
An efficient tandem aldol condensation/Michael addition process of unactivated aldehydes and 1,3-cyclohexanedione is described. This transformation proceeds without any catalyst at room temperature with high isolated yields. By a fine-tuning of reaction conditions an access to both the aldol condensation/Michael addition products or to the dehydrated cyclized 9-substituted 1,8-dioxo-xanthenes is given
Monomers for Preparation of Amide-Linked RNA: Asymmetric Synthesis of All Four Nucleoside 5‘-Azido 3‘-Carboxylic Acids
作者:Eriks Rozners、Yang Liu
DOI:10.1021/jo0515879
日期:2005.11.1
couplings, the nucleoside aminoacid equivalents. Herein, we report enantioselective synthesis of 5‘-azido 3‘-carboxylic acid derivatives of allfour natural ribonucleosides. The key transformations in our synthesis are a double asymmetric ene reaction and a stereoselective iodolactonization that form the basic carbon skeleton of the modified ribose. Standard nucleoside synthesis is followed by a short