Kasana, VirendraAgarwal, Deepali2016-06-062016-06-062015-06http://krishikosh.egranth.ac.in/handle/1http://krishikosh.egranth.ac.in/handle/1/66816Thesis-PhDDerivatives of formamide, α-aminophosphonate, 3,4-dihydropyrimidin-2(1H)- one and naphthoquinone were synthesised using green synthetic methods. Calcium chloride dihydrate supported on rice husk (RiH-CaCl2.2H2O) offers simple, efficient and economical solid support method for C-N bond formation for N-formylation of amines at room temperature. Natural acid catalysts, lemon juice (extracted from Citrus limonium) and yogurt (bacterial fermented milk), were developed for one pot synthesis of α-aminophosphonates and amino acid derivatives of α-aminophosphonate under solvent free condition. CaCl2.2H2O offers efficient method for direct carbon-carbon bond formation through soft enolization to promote the Biginelli three component condensation reaction from a diversity of aromatic aldehydes. N-formylated α- aminophosphonate and 3,4-dihydropyrimidin-2(1H)-one derivatives were synthesized using β-cyclodextrin in the presence of ionic liquid, TBAB, in good to excellent yield. Novel derivative of 1, 4-Naphthoquinone was synthesized in excellent yield as pH indicator and chemosensor for Sn2+, Hg2+ and Zn2+. Citrulline and tyrosine derivatives of α-aminophosphonate and compounds with -OH, -OCH3 substituent groups on benzene ring of α-aminophosphonates and 3,4-dihydropyrimidin-2(1H)-ones showed strong antioxidant and enzyme (tyrosinase, α-amylase and α-glucosidase) inhibition activity. N-formylation increased the antioxidant and enzyme inhibition activity of α- aminophosphonates and 3,4-dihydropyrimidin-2(1H)-ones with para -NO2 and -F groups on benzene ring. N-formylated 3,4-dihydropyrimidin-2(1H)-ones were found to increase the Fe2+ chelating activity.enenzymes, inhibitors, antioxidants, biological activity, formamide, derivatives, catalysts, bioactive compoundsThesis