M. Sudershan Rao

Sodium Dodecyl Sulfate-assisted Synthesis of 1-(Benzothiazolylamino)methyl-2-naphthols in Water

An efficient synthesis of 1-(benzothiazolylamino)methyl-2-naphthols has been developed in water by one-pot condensation of 2-naphthol, aldehydes and 2-aminobenzothiazole catalyzed by sodium dodecyl sulfate. Advantages of the methodology include a very short reaction time, excellent yields and catalytic use of the sodium dodecyl sulfate.

A simple and efficient thia-Michael addition to α, β-unsaturated ketones catalyzed by Yb(OTf)3 in [bmim][BF4]

Yb(OTf)3 in an ionic liquid [bmim][BF4] has been described as an efficient catalyst for the thia-Michael addition of thiols to α,β -unsaturated ketones to give β -aryl-β-mercapto ketones in 82–94% yield and the catalyst along with ionic liquid was recycled and reused.

An Efficient and Simple One-Pot Synthesis of β-Acetamido Ketones Catalyzed by Ytterbium Triflate in Ionic Liquid

Ytterbium triflate immobilized in the ionic liquid [bmim][BF4] catalyzes the three-component coupling of aromatic aldehydes, enolizable ketones, and acetonitrile in the presence of acetyl chloride at room temperature to afford β-acetamido ketones in good yields. The catalyst can be recovered and recycled for subsequent reactions without any appreciable loss of efficiency.

An expeditious and greener one-pot synthesis of 4H-chromenes catalyzed by Ba(OTf)2 in PEG-water

Abstract An expeditious synthesis of 4H-chromenes has been achieved by three-component one-pot condensation of 1,3-diketone, aldehyde, and malononitrile using Ba(OTf)2 as catalyst in PEG-water at room temperature. Results from various reaction media and different metal triflates as catalysts show that choice of proper catalyst and the solvent system play a key role in the synthesis of 4H-chromene-3-carbonitrile derivatives. The catalyst can be recovered and reused at least five times without loss of activity. The application of an eco-friendly, noncorrosive, and reusable catalytic system with high isolated yield of the products makes this method advantageous.