Majjigapu Ravinder Reddy

Synthesis of pyrano and furanoquinolines using silica chloride or amberlyst-15 as a heterogeneous catalyst

The coupling of three components, anilines, benzaldehydes and 3,4-dihydro-2H- pyran or 2,3-dihydrofuran to prepare the corresponding pyrano or furanoquinolines has been achieved efficiently using silica chloride or Amberlyst-15 as a heterogeneous catalyst. Amberlyst-15 can be recovered and reused.

Silica‐Supported Sodium Hydrogen Sulfate Catalyzed Facile Transformation of p‐Hydroxybenzyl Alcohols to p‐Hydroxybenzyl Ethers and Thioethers

Abstract The heterogeneous catalyst, silica‐supported sodium hydrogen sulfate (NaHSO4 · SiO2) has been found to be highly efficient in carrying out the transformation of p‐hydroxybenzyl alcohols at room temperature to p‐hydroxybenzyl ethers and thioethers in very high yields. #Part 31 in the series, “Studies on Novel Synthetic Methodologies,” For part 30 see Ref.1

Perchloric acid adsorbed on silica gel : an efficient heterogeneous reusable catalyst for synthesis of 1,5-benzodiazepines

The condensation of o-phenylenediamines with both aliphatic (acyclic and cylic) and aromatic ketones has been carried out to produce 1,5-benzodiazepines in high yields using perchloric acid adsorbed on silica gel as a heterogeneous catalyst. The catalyst can be recycled.