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Echchukattula Dadapeer,Syed Rasheed,Chamarthi Naga Raju 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
The divergent synthesis of novel phosphorus-containing dendrimer with 4,4'-sulphonyldiphenol at the core has been accomplished involving simple condensation reactions using P(O)Cl_3, P(S)Cl_3, 3-amino-phenol, 3-hydroxy-benzaldehyde, and 2-butyn 1, 4-diol. The final compound was a Schiff’s base macromolecule possessing 4 imine bonds, 8 acetylenic bonds and 8 OH groups at the periphery. The structures of intermediate compounds were confirmed by IR, NMR (^(1)H,^(13)C and ^(31)P), LC-Mass and C, H, N analysis. The structure of the final dendrimer (5) was confirmed by IR, NMR (^(1)H,^(13)C and ^(31)P, MALDI-TOF-MS, and C, H, N analysis. The surface morphological characteristics of the final dendrimer were understood by Scanning Electronic Microscopic study (SEM). The thermal stability of the final dendrimer was studied by TGA/DTA analysis.
Dadapeer, Echchukattula,Rasheed, Syed,Raju, Chamarthi Naga Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
The divergent synthesis of novel phosphorus-containing dendrimer with 4,4'-sulphonyldiphenol at the core has been accomplished involving simple condensation reactions using $P(O)Cl_3$, $P(S)Cl_3$, 3-amino-phenol, 3-hydroxy-benzaldehyde, and 2-butyn 1, 4-diol. The final compound was a Schiff's base macromolecule possessing 4 imine bonds, 8 acetylenic bonds and 8 OH groups at the periphery. The structures of intermediate compounds were confirmed by IR, NMR ($^1H$, $^{13}C$ and $^{31}P$), LC-Mass and C, H, N analysis. The structure of the final dendrimer (5) was confirmed by IR, NMR ($^1H$, $^{13}C$ and $^{31}P$), MALDI-TOF-MS, and C, H, N analysis. The surface morphological characteristics of the final dendrimer were understood by Scanning Electronic Microscopic study (SEM). The thermal stability of the final dendrimer was studied by TGA/DTA analysis.
Microwave Assisted One-pot Synthesis of Novel α-Aminophosphonates and heir Biological Activity
Rao, Alahari Janardhan,Rao, Pasupuleti Visweswara,Rao, Valsani Koteswara,Mohan, Challamchalla,Raju, Chamarthi Naga,Reddy, Cirandur Suresh Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.7
A simple and efficient synthesis of various $\alpha$-aminophosphonates (3a-l) by the reaction of substituted aromatic/heterocyclic aldehydes, 2-amino-6-methoxy-benzothiazole and dibutyl/diphenyl phosphites under microwave irradiation without catalyst was accomplished. The phosphonates were characterized by elemental analysis, IR, $^1H$, $^{13}C$- and $^{31}PNMR$ spectra. They showed promising antimicrobial, anti-oxidant activities depending on the nature of bioactive groups at the $\alpha$-carbon.
Microwave Assisted One-pot Synthesis of Novel α-Aminophosphonates and Their Biological Activity
Alahari Janardhan Rao,Pasupuleti Visweswara Rao,Valsani Koteswara Rao,Challamchalla Mohan,Chamarthi Naga Raju,Cirandur Suresh Reddy 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.7
A simple and efficient synthesis of various α-aminophosphonates (3a-l) by the reaction of substituted aromatic/heterocyclic aldehydes, 2-amino-6-methoxy-benzothiazole and dibutyl/diphenyl phosphites under microwave irradiation without catalyst was accomplished. The phosphonates were characterized by elemental analysis, IR, 1H, 13C- and 31PNMR spectra. They showed promising antimicrobial, anti-oxidant activities depending on the nature of bioactive groups at the α-carbon.
Synthesis and Cytotoxicity Evaluation of Phosphorylated Derivatives of Ribavirin
Rao, Valasani Koteswara,Reddy, Sanapalli Subba,Babu, Kilaru Raveendra,Kumar, Kuntrapakam Hema,Ghosh, Sunil Kumar,Raju, Chamarthi Naga Korean Chemical Society 2011 대한화학회지 Vol.55 No.6
Novel phosphorylated derivatives of ribavirin 5-16 were synthesized by the reaction of 4-nitrophenyl phosphorodichloridate with various amino acid esters in the presence of triethylamine in dry tetrahydrofuran through the intermediates 3. On further reaction of 3 with ribavirin in THF and pyridine in the presence of TEA afforded the title compounds 5-16. Their structures were characterized by IR, $^1H$, $^{13}C$, $^{31}P$ NMR and mass spectral analyses. All the title compounds were found to exhibit potent in vitro anticancer activity against MCF-7 breast cancer cell lines.