Ligand-Free Copper-Manganese Spinel Oxide-Catalyzed Tandem One-Pot C-H Amidation and<i>N</i>-Arylation of Benzylamines: A Facile Access to 2-Arylquinazolin-4(3<i>H</i>)-ones
作者:Rohit Sharma、Ram A. Vishwakarma、Sandip B. Bharate
DOI:10.1002/adsc.201600549
日期:2016.10.6
An efficient ligand‐free copper‐manganese (Cu‐Mn) spinel oxide‐catalyzed direct tandem C−H oxygenation and N‐arylation of benzylamines has been developed. The method has been utilized for the synthesis of medicinally important 2‐arylquinazolin‐4(3H)‐ones. Salient features of this method include recyclable catalyst, no ligand, excellent product yields, shorter reaction times and a broad substrate scope
by nature, organic chemists have been using a divergent strategy to improve the synthetic efficiency of diverse molecules. Transition-metal-catalyzed C–H functionalization has become one of the most straightforward, powerful, and atom-economical methods to construct complex scaffolds. However, C–H activation initiated divergent transformation to prepare diverse molecules is still limited. To address
Bimetallic Cu-Mn-Catalyzed Synthesis of 2-Arylquinazolin-4(3<i>H</i>)-ones: Aqueous Ammonia as Source of a Ring Nitrogen Atom
作者:Rohit Sharma、Ram A. Vishwakarma、Sandip B. Bharate
DOI:10.1002/ejoc.201601024
日期:2016.11
aryl aldehydes, and aqueous ammonia has been developed. This protocol employs Cu–Mn spinel oxide as a heterogeneous catalyst and does not require the presence of a ligand or external oxidant. Key features of the reaction include a recyclable catalyst, ligand-free conditions, and a wide scope of possible substrates. The mechanism begins with the replacement of the bromine atom with NH2 from aqueous
A Simple One-Pot Synthesis of 2-Substituted Quinazolin-4(3H)-ones from 2-Nitrobenzamides by Using Sodium Dithionite
作者:Simón López、Angel Romero、José Salazar
DOI:10.1055/s-0033-1338854
日期:——
simple one-pot procedure for the preparation of 2-(het)arylquinazolin-4(3H)-ones starting from readily available 2-nitrobenzamides and (het)aryl aldehydes is described. Sodium dithionite is used as the reducing agent for the nitro group, and its decomposition in situ in aqueous N,N-dimethylformamide leads to the final oxidation step that gives the desired heterocyclic compounds. A simple one-pot procedure
6-Alkylamino- and 2,3-Dihydro-3‘-methoxy-2-phenyl-4-quinazolinones and Related Compounds: Their Synthesis, Cytotoxicity, and Inhibition of Tubulin Polymerization
作者:Mann-Jen Hour、Li-Jiau Huang、Sheng-Chu Kuo、Yi Xia、Kenneth Bastow、Yuka Nakanishi、Ernest Hamel、Kuo-Hsiung Lee
DOI:10.1021/jm000151c
日期:2000.11.1
As part of our continuing search for potential anticancer candidates among 2-phenyl-4-quinolones and 2-phenyl-4-quinazolinones, two series of 6,7,2',3',4',5'-substituted 2-phenyl-4-quinazolinones and 6,2',3',4',5'-substituted 2,3-dihydro-2-phenyl-4-quinazolinones were synthesized and evaluated for cytotoxicity and as inhibitors of tubulin polymerization. In general, a good correlation was found between the two activities. Five of the 6-substituted heterocyclic 2-phenyl-4-quinozolinones (37-51) showed significant cytotoxicity against a panel of human tumor cell lines with EC50 values in the low micromolar to nanomolar concentration ranges. Compound 38 was the most potent of these compounds, as well as the most potent inhibitor of tubulin polymerization in this series. The activity of 38 was in the same range as those of the antimitotic natural products, colchicine, podophyllotoxin, and combretastatin A-4. Substituted 2-phenyl-4-quinazolinones and 2,3-dihydro-2-phenyl-4-quinazolinones also displayed highly selective cytotoxicity against the ovarian cancer 1A9 and P-gp resistant KB-VIN cell lines.