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Synthesis of a variety of 1,5-benzothiazepines using polyethylene glycol PEG-400 as a medium and promoter. The synthesis is carried out using ultrasonic irradiation. The advantage of this protocol is that it eco-friendly, mild reaction conditions and the synthesis highlights the use of ultrasound irradiation.

SnO2/SiO2 catalyzed synthesis of 2,4,5-triarylimidazoles by the condensation of benzoin, aromatic aldehydes and ammonium acetate in presence of ethanol as solvent. The synthesis highlights a synthesis and use of SnO2/SiO2 nanocomposite heterogeneous catalyst and its reusability. The method is cost effective and ecofriendly. And use of ethanol as a solvent makes the method more green and efficient. The method has simple workup procedure and the products are obtained in good to moderate yields.

In present chapter we have reported green and highly efficient method for synthesize novel series of substituted -1H-indazol-3-amine derivative (3a-h) by cyclocondensation reaction of substituted benzonitrile (1a-h) and substituted Hydrazine (2a-h) using ceric (IV) ammonium nitrate (CAN) as a catalyst, EtOH-H2O as a ecofriendly media and reaction was carried out under ultrasound irradiation green method. The structures of newly synthesized indazole derivative (3a-h) were corroborated through spectral investigation such as elemental analysis and spectral studies like IR, C13 NMR, Mass spectra and 1H NMR. The compounds were assessed for their in-vitro antimicrobial activity with pathogenic microbe comprising Gram positive bacterial strains, S. aureus and Gram negative strains E.coli, P.vulgaris, and S. typhi at different concentration. The consequence of bioassay is compared with standard drug Chloramphenicol.

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