Screening for In Vitro Antimycobacterial Activity and Three-Dimensional Quantitative Structure-Activity Relationship (3D-QSAR) Study of 4-(arylamino)coumarin Derivatives
作者:Vijay Virsdoia、Mushtaque S. Shaikh、Atul Manvar、Bhavik Desai、Alpesh Parecha、Raju Loriya、Kinnari Dholariya、Gautam Patel、Vipul Vora、Kuldip Upadhyay、Karia Denish、Anamik Shah、Evans C. Coutinho
DOI:10.1111/j.1747-0285.2010.00997.x
日期:2010.11
The resurgence of tuberculosis and the emergence of multidrug‐resistant strains of Mycobacteria necessitate the search for new classes of antimycobacterial agents. We have synthesized a small library of 50 analogues of 4‐(arylamino)coumarins with various aromatic amines at the C4‐ position of the coumarin scaffold. The compounds were evaluated for antimycobacterial activity against Mycobacterium tuberculosis H37Rv with rifampicin as the standard. Of the molecules synthesized, compound 9 was found to be most potent with a minimum inhibitory concentration >6.25 μg/mL for 100% inhibition. In an effort to develop new and more effective molecules in this series, the relationship between structure and activity was investigated by comparative molecular field analysis. Various models were generated using comparative molecular field analysis alone and comparative molecular field analysis plus a hydropathy field (HINT). In all, eight models were generated with atom‐fit and field‐fit alignment strategies. The comparative molecular field analysis models (Models 3a and 4a) based on field‐fit alignment were the best with statistically good correlation coefficients (r2) and cross‐validated q2. The values of r2pred for the validation set were 0.469 and 0.516. Based on the comparative molecular field analysis contours, some insights into the structure–activity relationship of the compounds could be gained.
A regioselective synthesis of pentacyclic compounds containing coumarin, pyrrole, indene without catalysts under microwave irradiation
作者:Zhi-Wei Chen、Jun-Bo Hou、Zhao-Ran Dai、Xiao-Feng Yang
DOI:10.1016/j.cclet.2016.04.009
日期:2016.10
Abstract A concise and efficient approach was developed for the synthesis of pentacyclic compounds containing coumarin, pyrrole, indene in a regioselective manner in good yields via the reactions of N -substituted 4-aminocoumarin compounds and ninhydrin using microwave irradiation. No catalysts are required in our protocol.
Magnetically Retrievable Nano Crystalline Nickel Ferrite- Catalyzed Aerobic, Ligand-Free CN, CO and CC Cross- Coupling Reactions for the Synthesis of a Diversified Library of Heterocyclic Molecules
作者:Sanjay Paul、Koyel Pradhan、Sirshendu Ghosh、S. K. De、Asish R. Das
DOI:10.1002/adsc.201300686
日期:2014.4.14
A new nickel ferrite nano‐crystal‐catalyzed, ligand‐free strategy for the construction of CN, CO, and CC bonds is presented, in which easily available nitrogen and oxygen nucleophiles, aryl/heteroaryl halides and arylboronic acids are used for the cross‐couplingreactions. The reactions can be performed at low catalyst loadings with excellent functional group tolerance and chemoselectivity. A variety