Deformylation of indole and azaindole-3-carboxaldehydes using anthranilamide and solid acid heterogeneous catalyst via quinazolinone intermediate
摘要:
The deformylation of indole and azaindole-3-carboxaldehydes was achieved in the presence of anthranilamide and a solid acid heterogeneous catalyst under reflux conditions in 25-90% yield. The reaction proceeds via quinazolinone intermediate, which undergoes acid catalyzed cleavage to form deformylated product. (c) 2012 Elsevier Ltd. All rights reserved.
A Facile Microwave and SnCl2 Synthesis of 2,3-Dihydroquinazolin-4(1H)-ones
作者:Nicholas S. O'Brien、Adam McCluskey
DOI:10.1071/ch20101
日期:——
An elegantly simple, facile, and robust approach to a scaffold of biological importance, 2,3-dihydroquinazolin-4(1H)-ones, is reported. A catalytic 1 % SnCl2/microwave-mediated approach afforded access to pure material, collected by cooling and filtration after 20-min microwave irradiation at 120°C. A total of 41 analogues were prepared in isolated yields of 17–99 %. This process was highly tolerant
Efficient synthesis of 2,3-dihydroquinazolin-4(1H)-ones using heterogeneous solid acid catalysts: unexpected formation of 2,3-dihydro-2-(4-(tetrahydro-2H-pyran-2-yloxy)butyl)-quinazolin-4(1H)-one
作者:Sandip Bibishan Bharate、Nagaraju Mupparapu、Sudhakar Manda、Jaideep B. Bharate、Ramesh Mudududdla、Rammohan R. Yadav、Ram A. Vishwakarma
DOI:10.3998/ark.5550190.0013.826
日期:——
The heterogeneoussolid acid catalysts Amberlyst-15 and silica-HClO 4 displays efficient catalytic properties for the synthesis of 2,3-dihydroquinazolin-4( 1H )-ones from anthranilamide and various aldehydes/ ketones under mild reaction conditions and in good yields. These catalysts also showed good catalytic activity for condensation of anthranilamide with a cyclic enol ether 3,4-dihydropyran and
Pentafluorophenylammonium triflate as a suitable and effective metal-free catalyst for the synthesis of quinazoline derivatives via one-pot multicomponent method
作者:Samad Khaksar、Milad Gholami
DOI:10.1007/s11164-013-1483-7
日期:2015.6
A simple and facile synthesis of highly functionalized quinazoline derivatives has been successfully developed by treatment of aldehydes, ammonium acetate, and 2-aminoaryl ketones or isatoic anhydride under reflux conditions in the presence of a pentafluorophenylammonium triflate (PFPAT) organocatalyst. These catalytic condensation reactions represent green chemical processes, while the PFPAT organocatalyst is air-stable, cost-effective, easy to handle, and easily removed from the reaction mixtures.
Abstract An expeditious synthesis of 2,3-dihydroquinazolin-4(1H)-ones in the presence of oxalic acid as an environmentally friendly organocatalyst is reported. The salient features of the protocol are high yields, green reaction profile, shorter reaction times, and simple experimental and work-up procedure. Graphical Abstract
Meridianin G and its analogs as antimalarial agents
作者:Sandip B. Bharate、Rammohan R. Yadav、Shabana I. Khan、Babu L. Tekwani、Melissa R. Jacob、Ikhlas A. Khan、Ram A. Vishwakarma
DOI:10.1039/c3md00097d
日期:——
clone, showing a higher selectivity index >24.1. Among the analogs, N1-morpholinoyl meridianin C analog displayed antimalarial activity against both clones, showing selectivity indices up to 25.1. Meridianin C along with a few other analogs showed weak to moderate antileishmanial activity against Leishmania donovani promastigotes, the best analog being a C-ring modified 5-iodo meridianin showing an IC50