Author
B. Sunil Kumar
Bio: B. Sunil Kumar is an academic researcher from National Institute of Technology, Warangal. The author has contributed to research in topics: Catalysis & Aryl. The author has an hindex of 8, co-authored 30 publications receiving 467 citations.
Topics: Catalysis, Aryl, Biginelli reaction, One-pot synthesis, Selectfluor
Papers
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TL;DR: In this paper, a simple and convenient procedure for the synthesis of aryl-14 H -dibenzo[ a. j ]xanthenes was described through a one-pot condensation of β-naphthol with aryls aldehydes in the presence of sulfamic acid as the catalyst in a solvent-free media using both conventional heating and microwave irradiation.
204 citations
TL;DR: In this article, a three component coupling of one pot reaction which servers as the most convenient route to the synthesis of benzopyran derivatives using the TiCl4 catalyst (10 mol %) under solvent free conditions is described.
57 citations
TL;DR: In this article, an efficient synthesis of 3,4−dihydropyrimidinones (DHPMs) using bismuth subnitrate as the catalyst for the first time from an aldehyde, β−ketoester, and urea in acetonitrile is described.
45 citations
37 citations
TL;DR: In this article, a convenient procedure for the synthesis of benzo[g]-and benzo [h]chromene derivatives via one-pot three-component condensation of aromatic aldehydes with malononitrile or ethyl cyanoacetate and 1-or 2-naphthol in the presence of 10 mol % of titanium tetrachloride as catalyst is reported.
Abstract: A convenient procedure is reported for the synthesis of benzo[g]-and benzo[h]chromene derivatives via one-pot three-component condensation of aromatic aldehydes with malononitrile or ethyl cyanoacetate and 1-or 2-naphthol in the presence of 10 mol % of titanium tetrachloride as catalyst. The reactions require no solvent; they are characterized by simple experimental procedure and easy isolation and can be performed on enlarged scale.
28 citations
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398 citations
TL;DR: In this paper, mixed materials of the metal-organic framework (MOF), chromium(III) terephthalate (MIL-101), and phosphotungstic acid (PTA) were synthesized in aqueous media in the absence of hydrofluoric acid XRD analysis indicates the presence of ordered PTA assemblies residing in both the large cages and small pores of MIL-101, which suggests the formation of previously undocumented structures.
Abstract: Hybrid materials of the metal–organic framework (MOF), chromium(III) terephthalate (MIL-101), and phosphotungstic acid (PTA) were synthesized in aqueous media in the absence of hydrofluoric acid XRD analysis of the MIL101/PTA composites indicates the presence of ordered PTA assemblies residing in both the large cages and small pores of MIL-101, which suggests the formation of previously undocumented structures The MIL101/PTA structure enables a PTA payload 15–2 times higher than previously achieved The catalytic performance of the MIL101/PTA composites was assessed in the Baeyer condensation of benzaldehyde and 2-naphthol, in the three-component condensation of benzaldehyde, 2-naphthol, and acetamide, and in the epoxidation of caryophyllene by hydrogen peroxide The catalytic efficiency was demonstrated by the high (over 80–90%) conversion of the reactants under microwave-assisted heating In four consecutive reaction cycles, the catalyst recovery was in excess of 75%, whereas the product yields were
358 citations
TL;DR: In this article, a wide variety of 2-amino-4H-chromene derivatives with diverse substituents on the 4Hchromene ring were efficiently prepared via one-pot, three-component reaction of an aromatic aldehyde, malononitrile (or ethyl cyanoacetate), and diverse enolizable C-H activated acidic compounds in the presence of low loading of potassium phthalimide-N-oxyl (POPINO), as a new organocatalyst, in aqueous media.
238 citations
TL;DR: This review article summarizes the applications of bismuth(III) compounds in organic synthesis since 2002 and is largely organized by the reaction type although some reactions can be placed in multiple sections.
Abstract: This review article summarizes the applications of bismuth(III) compounds in organic synthesis since 2002. Although there are an increasing number of reports on applications of bismuth(III) salts in polymerization reactions, and their importance is acknowledged, they are not included in this review. This review is largely organized by the reaction type although some reactions can clearly be placed in multiple sections. While every effort has been made to include all relevant reports in this field, any omission is inadvertent and we apologize in advance for the same (358 references).
219 citations
TL;DR: In this paper, a simple and efficient method for the synthesis of aryl-14 H -dibenzo[ a, j ]xanthenes and 1,8-dioxo-octahydro-xanthens using silica sulfuric acid as a reusable eco-friendly catalyst under solvent-free conditions is described.
160 citations