A mild and efficient reaction of the Bestmann–Ohirareagent with N-unprotected isatin-derived olefins has been developed for the selective synthesis of spiro-pyrazoline-oxindoles and tricyclic pyrazoles. The reaction features an attractive product-selectivity depending on the substituent on isatin-derived olefin. Treatment of 3-aryl/alkylideneoxindoles with BOR afforded spiropyrazoline-oxindoles, whereas
Anticancer spiro[cyclopropane-1,3′-indolin]-2′-ones are accessible through a transition metal-free diastereoselective cyclopropanation using in situ generated diazo-compounds.
synthesis of novel scaffolds based on pyrrolo[2,3-c]pyrazole bearing oxindole is accomplished by the acid-promoted sequential reactions between benzoylacetonitriles, phenylhydrazine, and 3-phenacylideneoxindoles as readily available starting materials. This value structure is dexterously embraced with oxindole, pyrrole, and pyrazoleheterocycles, which are famous for their enriched biological properties
An ultrasound assisted green protocol for the synthesis of quinoxaline based bisspirooxindoles: Crystal structure analysis, enone umpolung, DFT calculations, anti-cancer activity, and molecular docking studies
作者:Sravanthi Baddepuri、Bhargava Sai Allaka、Rama Krishna Gamidi、Mohmmad Faizan、Ravinder Pawar、Srinivas Basavoju
DOI:10.1080/00397911.2023.2199360
日期:2023.6.3
Abstract A series of novel quinoxaline based bisspirooxindolo-pyrrolizidines were synthesized through 1,3-dipolar cycloaddition under ultrasonication with shorter reaction time and good yields. The compounds were well characterized by various spectroscopic methods and finally single crystal X-ray diffraction method (4c, 4d). DFT energy calculations confirm the regioselectivity due to enone umpolung
Highly diastereoselective synthesis of spiro[cyclopropane-1,3′-indolin]-2′-ones via catalyst-free cyclopropanation using ethyl diazoacetate
作者:Ram Awatar Maurya、Chada Narsimha Reddy、Geeta Sai Mani、Jeevak Sopanrao Kapure、Praveen Reddy Adiyala、Jagadeesh Babu Nanubolu、Kiran Kumar Singarapu、Ahmed Kamal
DOI:10.1016/j.tet.2014.05.065
日期:2014.8
Substituted 3-methyleneindolin-2-ones were efficiently cyclopropanated with ethyl diazoacetate to yield spiro[cyclopropane-1,3'-indolin]-2'-ones in a catalyst-free and highly diastereoselective reaction in a mixture of ethanol acetonitrile (1:1 v/v) as solvent. (C) 2014 Elsevier Ltd. All rights reserved.