Organic Chemistry: Current Research
Open Access
ISSN: 2161-0401
+44 1478 350008
ISSN: 2161-0401
+44 1478 350008
Rashmi Pundeer
Kurukshetra University, India
Scientific Tracks Abstracts: Organic Chem Curr Res
Background: The hypervalent iodine (III) compounds, (diacetoxyiodo)benzene (DIB) possess numerous applications as oxidizing reagent. A particularly useful methodology for the oxidative �±-functionalization of enolizable carbonyl compounds involves DIB in methanolic potassium hydroxide resulting in the synthesis of �±-hydroxydimethylacetals. The reaction is also applicable to enones which cannot form anion by �±-hydrogen abstraction such as chromone, chalcone, flavones and flavanone. Aim: To explore the fate of the reaction on the different chalcone derivatives to ascertain the substituent effect. Methodology: Initially, the reaction was applied to the chalcones having different substituents on ring 1, keeping the ring 2 unsubstituted. The oxidation reaction, indeed, afforded the expected acetals in all the cases except with the chalcone possessing p-NO2 substituent on ring 1. Formation of 2-methoxy-3-(methoxy(phenyl)methyl)-2-(4-nitrophenyl)oxirane was observed in this case. Next, the reaction was carried out with the chalcones differently substituted at ring 2 to determine the effect of the ring 2 substituents on the oxidative I(III) mediated approach. Interestingly, the corresponding acetal products were obtained in all the cases. To extend further the scope of the oxidative transformation, the reaction was performed with the chalcones substituted on both the rings (1 and 2). Findings: An interesting fact came forth that when the substituent is p-NO2 on ring 1 of the reactant, the product was always the oxirane, irrespective of either the ring 2 is substituted (with ortho or para substituent) or unsubstituted. Conclusion & Significance: The results show the wider applicability of the I(III) mediated methodology for the oxidation of �±,�²-unsaturated carbonyl compounds. The reaction offers an efficient route for the synthesis of novel oxiranes. Recent publications 1. Prakash O, Khurana V and Pundeer R (2016) Regioselective synthesis of some new 5-(4-aryl-2-oxobut-3-enyl)-3methyl-1-(6-substituted benzothiazol-2-yl)pyrazoles from aryloct-7-en-2,4,6-triones. Indian Journal of Heterocyclic Chemistry 26:133-139. 2. Pundeer R and Vijaykiran (2016) Organoiodine(III) mediated one-pot synthesis of several new coumarinyl-triazolotriazines. Organic Chemistry: An Indian Journal 12:106. 3. Pundeer R and Vijaykiran (2016) Green and expeditious synthesis of some 2-amino/arylamino-4-(1-naphthyl)thiazole derivatives using [hydroxyl(tosyloxy)iodo]benzene. Indian Journal of Heterocyclic Chemistry 25:311-17. 4. Pundeer R and Sushma (2015) Hypervalent iodine(III) reagent in the solid-state synthesis of 3,4-dihydropyrimidin2(1H)-ones. Indian Journal of Chemistry 54B:1275-1279. 5. Sushma Vijaykiran, Sharma C, Aneja R, Prakash O and Pundeer R (2015) A facile synthesis of some new 1-benzothiazolyl3-aryl/hetaryl-5-(3-aryl-1-phenyl-4- pyrazolyl) pyrazoles and their antimicrobial activity. Journal of Heterocyclic Chemistry 52:1817-1822.
Rashmi Pundeer is mainly concerned with the development of simple synthetic strategies for widely used organic compounds through the intermediacy of versatile, ecofriendly and readily available oxidizing reagents, the hypervalent iodine(III) reagents particularly, (diacetoxyiodo)benzene (DIB), [hydroxyl(tosyloxy)iodo] benzene (HTIB) and (dichloroiodo)benzene. She is also working towards the synthesis of nitrogen containing heterocyclic compounds particularly five and six membered ones of potential medicinal interest. Three scholars have completed Doctorate degree under her supervision.
Email:rashmichauhan@kuk.ac.in; dr.rashmip@gmail.com