T-type calcium channel antagonist activity, and new 4-methylene-quinazolin-2-ones, promising catalysts as N-heterocyclic olefins, have been prepared in good yield by a simple reaction between 2-aminobenzophenone, or 2-aminoacetophenone, and cyanomethyl anion electrogenerated by acetonitrile reduction at a graphite electrode, followed by the addition of different organic isocyanates and subsequent heterocyclization
Urea‐Functionalized Fe<sub>4</sub>L<sub>6</sub> Cages for Supramolecular Gold Catalyst Encapsulation to Control Substrate Activation Modes
作者:Meiling Xu、Xu Jing、Bin Sun、Cheng He、Joost N. H. Reek、Chunying Duan
DOI:10.1002/anie.202310420
日期:2023.11.6
A sulfonate-functionalized goldcatalyst and urea substrate have been found to be encapsulated in a urea-functionalized Fe4L6 cage through hydrogen bonding. The cagedcatalyst presents excellent performances compared to the free catalyst, with high selectivity obtained from the site-isolation effect imposed by the cage only allowing catalysis by π activation of the substrate. The high reactivity arises
已发现磺酸盐官能化的金催化剂和尿素底物通过氢键被封装在尿素官能化的Fe 4 L 6笼中。与游离催化剂相比,笼状催化剂表现出优异的性能,由于笼子的位点隔离效应而仅允许通过底物的π活化进行催化,因此具有高选择性。高反应性源于过渡态的稳定。
Sequential Oxidative Fragmentation and Skeletal Rearrangement of Peroxides for the Synthesis of Quinazolinone Derivatives
作者:Akash S. Ubale、Moseen A. Shaikh、Boopathy Gnanaprakasam
DOI:10.1021/acs.joc.1c00889
日期:2021.7.16
For the first time, the sequential reaction of peroxyoxindole that involves base-promoted oxidative fragmentation to isocyanate formation and primary amine or amino alcohol accelerated skeletal rearrangement to synthesize exo-olefinic-substituted quinazolinone or oxazoloquinazolinone is reported. The advantages of this new reaction include a broad substrate scope and transition-metal-free and room-temperature
NHC-Stabilized Gold(I) Complexes: Suitable Catalysts for 6-<i>exo</i>-dig Heterocyclization of 1-(<i>o</i>-Ethynylaryl)ureas
作者:Ana Gimeno、Mercedes Medio-Simón、Carmen Ramírez de Arellano、Gregorio Asensio、Ana B. Cuenca
DOI:10.1021/ol100595s
日期:2010.5.7
3-substituted 1-(o-ethynylaryl)ureas 1 selectively undergo either 6-exo-dig or 5-endo-dig cyclization (to give 4-methylene-3,4-quinazolin-2-ones 2 or indoles 3, respectively) depending on the choice of the metal, ligand, and reaction conditions. The best results (up to 96% yield) in the preparation of the hydroamination products 2 are achieved with the highly bulky NHC-stabilized cationic gold(I) complex