Palladium(II) in electrophilic activation of aldehydes and enones: efficient C-3 functionalization of indoles
作者:Swapna Sarita Mohapatra、Priyabrata Mukhi、Anuradha Mohanty、Satyanarayan Pal、Aditya Omprakash Sahoo、Debjit Das、Sujit Roy
DOI:10.1016/j.tetlet.2015.08.080
日期:2015.10
The regioselectiveC-3 alkylation of indoles with aldehydes and enones as electrophiles is catalyzed by a d8 late transition metal complex PdCl2(MeCN)2 at room temperature in the presence of air/moisture and in the absence of any additional acid/base, additive, or ligand. The active catalyst in this alkylation is an organometallic intermediate C1 which is formed from the reaction of indole with the
Discovery of 3,3′-diindolylmethanes as potent antileishmanial agents
作者:Sandip B. Bharate、Jaideep B. Bharate、Shabana I. Khan、Babu L. Tekwani、Melissa R. Jacob、Ramesh Mudududdla、Rammohan R. Yadav、Baljinder Singh、P.R. Sharma、Sudip Maity、Baldev Singh、Ikhlas A. Khan、Ram A. Vishwakarma
DOI:10.1016/j.ejmech.2013.02.024
日期:2013.5
An efficient protocol for synthesis of 3,3'-diindolylmethanes using recyclable Fe-pillared interlayered clay (Fe-PILC) catalyst under aqueous medium has been developed. All synthesized 3,3'-diindolylmethanes showed promising antileishmanial activity against Leishmania donovani promastigotes as well as axenic amastigotes. Structure-activity relationship analysis revealed that nitroaryl substituted diindolylmethanes showed potent antileishmanial activity. The 4-nitrophenyl linked 3,3'-diindolylmethane 8g was found to be the most potent antileishmanial analog showing IC50 values of 7.88 and 8.37 mu M against both L donovani promastigotes and amastigotes, respectively. Further, a pharmacophore based QSAR model was established to understand the crucial molecular features of 3,3'-diindolylmethanes essential for potent antileishmanial activity. These compounds also exhibited promising antifungal activity against Cryptococcus neoformans, wherein fluorophenyl substituted 3,3'-diindolylmethanes were found to be most potent antifungal agents. Developed synthetic protocol will be useful for economical and eco-friendly synthesis of potent antileishmanial and antifungal 3,3'-diindolylmethane class of compounds. (C) 2013 Elsevier Masson SAS. All rights reserved.
Tetranuclear Zn/4f coordination clusters as highly efficient catalysts for Friedel–Crafts alkylation
作者:Kieran Griffiths、Prashant Kumar、Geoffrey R. Akien、Nicholas F. Chilton、Alaa Abdul-Sada、Graham J. Tizzard、Simon J. Coles、George E. Kostakis
DOI:10.1039/c6cc03608b
日期:——
A series of custom-designed high yield isoskeletal tetranuclear 3d/4f coordination clusters showing high efficiency as catalysts with low catalytic loadings in Friedel Crafts alkylation are described for the first time....