http://nopr.niscair.res.in/handle/123456789/313 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/3847 Title: Ecofriendly solvent free microwave enhanced alkyl migration in N-alkyl anilines in dry media conditions <br/> <br/>Authors: Selvakumar, S; Easwaramurthy, M; Raju, G J <br/> <br/>Abstract: A rapid, cleaner, cost effective and ecofriendly synthesis of exclusive para alkyl anilines in solvent free conditions using solid supports under microwave irradiation is achieved. <br/> <br/>Page(s): 713-715 http://nopr.niscair.res.in/handle/123456789/667 Title: Cascade synthesis of racemic 3-arylphthalides <br/> <br/>Authors: Patil, S T; Karnik, A V <br/> <br/>Abstract: Use of the modified reagent system of NaBH₄-Amberlyst-15 (H⁺) for the reduction of o-aroylbenzoates 1a-f followed by simple trituration in aqueous HCl, results in the formation of 3-arylphthalide 3a-f in very short reaction time. <br/> <br/>Page(s): 710-712 http://nopr.niscair.res.in/handle/123456789/666 Title: Ce(IV) ammonium nitrate catalyzed chemoselective deprotection of acetonides <br/> <br/>Authors: Jana, S; Roy, S C <br/> <br/>Abstract: Highly chemoselective deprotection of diacetone sugars have been achieved at room temperature in excellent yields using commercially available ceric ammonium nitrate (20 mol%) in moist CH₃CN. <br/> <br/>Page(s): 707-709 http://nopr.niscair.res.in/handle/123456789/664 Title: Pyrido[2,3-d]pyrimidines and their ribofuranosides: Synthesis and antimicrobial investigations <br/> <br/>Authors: Kumar, Naresh; Tiwari, Sangeeta; Yadav, Ashok K <br/> <br/>Abstract: 4-Amino-5,7-disubstituted pyrido[2,3-d]pyrimidines 3, 4-amino-5,7-disubstituted pyrido[2,3-d]pyrimidine-2(1H)-thiones 4, and 4-amino-3,5,7-trisubstituted pyrido [2,3-d]pyrimidines-2,4-(1H, 3H)-dione 5 have been synthesized by condensation of 2-amino-3-cyano-4,6-disubstituted pyridines 2 and formamide, thiourea and aryl isocyanate respectively. Compounds 2 have been prepared by the treatment of chalcones 1 with malononitrile in presence of ammonium acetate in quantitative yield. The heterocyclic bases viz. 4 and 5 have been treated with hexamethyl disilazane to give S/O-trimethylsilyl derivative, in situ, which on condensation with β-D-ribofuranosyl-1-acetate-2,3,5-tribenzoate yield the corresponding nucleoside, i.e. 4-amino-5,7-disubstituted-1-( β-D-ribofuranosyl) pyrido[2,3-d]-2(1H)-thiones 6 and 4-imino-3,5,7-trisubstituted-1(2',3',5'-tri-O-benzoyl-β-D-ribofuranosyl)pyrido[2,3-d]pyrimidin-2-ones 7. <br/> <br/>Page(s): 702-706