Domino routes to substituted benzoindolizines: tandem reorganization of 1,3-dipolar cycloadducts of nitrones with allenic esters/ketones and alternative cycloaddition–palladium catalyzed cyclization pathway
作者:Ashish Kapur、Kamal Kumar、Lakhwinder Singh、Parminder Singh、Munusamy Elango、Venkatesan Subramanian、Vivek Gupta、Priyanka Kanwal、Mohan Paul S. Ishar
DOI:10.1016/j.tet.2009.03.076
日期:2009.6
intramolecular aza Diels–Alderreaction in the intermediate C. DFT calculations of various parameters for diene and dienophile components in the proposed intermediate C have revealed that conformational constraints imposed by the alkyl groups (R=Me, Et) favor intramolecular aza-Diels–Alder cycloaddition. An alternative domino route to benzoindolizines (9a,d,g) involving sequential one-pot cycloaddition of azadienes
Chromanyl–isoxazolidines as Antibacterial agents: Synthesis, Biological Evaluation, Quantitative Structure Activity Relationship, and Molecular Docking Studies
作者:Gagandeep Singh、Anuradha Sharma、Harpreet Kaur、Mohan Paul S. Ishar
DOI:10.1111/cbdd.12653
日期:2016.2
Regio‐ and stereoselective 1,3‐dipolar cycloadditions of C‐(chrom‐4‐one‐3‐yl)‐N‐phenylnitrones (N) with different mono‐substituted, disubstituted, and cyclic dipolarophiles were carried out to obtain substituted N‐phenyl‐3′‐(chrom‐4‐one‐3‐yl)‐isoxazolidines (1‐40). All the synthesized compounds were assayed for their in vitro antibacterial activity and display significant inhibitory potential; in particular, compound 32 exhibited good inhibitory activity against Salmonella typhymurium‐1 & Salmonella typhymurium‐2 with minimum inhibitory concentration value of 1.56 μg/mL and also showed good potential against methicillin‐resistant Staphylococcus aureus with minimum inhibitory concentration 3.12 μg/mL. Quantitative structure activity relationship investigations with stepwise multiple linear regression analysis and docking simulation studies have been performed for validation of the observed antibacterial potential of the investigated compounds for determination of the most important parameters regulating antibacterial activities.
Kumar, Dhruva; Suresh; Sandhu, Jagir S., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2013, vol. 52, # 8, p. 1157 - 1160