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A new anti-feedant clerodane diterpenoid from tinospora cordifolia
Sivasubramanian, Aravind; Narasimha, Krishna Kumari Gadepalli; Rathnasamy, Rishikesan; Campos, Ana M. F. OliveiraPhytochemical investigation of the chloroform extract of Tinospora cordifolia yielded a new clerodane diterpenoid tincordin (1) along with tinosporide (2), 8-hydroxytinosporide (3), columbin (4), 8-hydroxycolumbin (5) and 10-hydroxycolumbin (6). The structure of the new compound was elucidated comprehensively using 1D and 2D NMR methods. All major clerodane diterpenoids isolated were tested for their efficacy a...
Naphthotriazole derivatives : synthesis and fluorescence properties
Campos, Ana M. F. Oliveira; Rodrigues, Lígia M.; Esteves, Ana Paula; Silva, Marília E.; Sivasubramanian, Aravind; Hrdina, Radim; Soares, Graça M. B.Eight fluorescent compounds containing a naphthotriazole moiety substituted at position 2 by a (vinylsulfonyl)aryl group or its precursors, containing hydroxyl or sulphonic groups or N-methylglycine, were prepared and characterized. The products were recovered in moderate yields after column chromatography or recrystallization and identified by proton and carbon nuclear magnetic resonance spectroscopy. Double r...
NMR analysis of a series of substituted pyrazolo[3,4-d]pyrimidines-4-amines
Rodrigues, Lígia M.; Sivasubramanian, Aravind; Pinto, Elisa M. M. S.; Campos, Ana M. F. Oliveira; Seijas, Julio A.; Vázquez-Tato, M. PilarA series of twenty one substituted pyrazolo[3,4-d]pyrimidines-4-amines were studied by 1H and 13C NMR. The application of two-dimensional techniques, HMQC and HMBC, allowed the complete assignment of the spectra for all the compounds.
Substituted pyrazolo[3,4-d]pyrimidines : microwave assisted, solvent free synth...
Campos, Ana M. F. Oliveira; Sivasubramanian, Aravind; Rodrigues, Lígia M.; Seijas, Julio A.; Vázquez-Tato, M. Pilar; Peixoto, FranciscoA simple and efficient method has been developed for the synthesis of various pyrazolo[3,4-d]pyrimidines using microwave irradiation under solvent-free conditions. The advantages of applying microwave irradiation compared with the classical method were demonstrated. The structures of all the compounds were confirmed by the usual techniques and in two cases by X-ray analysis. The compounds did not display apprec...
Synthesis of dyes derived from 1-aryl-5-amino-4-cyanopyrazoles
Gupta, Sanjay; Sivasubramanian, Aravind; Rodrigues, Lígia M.; Esteves, Ana Paula; Hrdina, Radim; Campos, Ana M. F. OliveiraProva tipográfica (In Press) ; Eight dyes were prepared by diazotisation of substituted amino-cyano pyrazoles and coupling to anilines or 2-naphthol. The dyes were fully characterised by spectroscopic techniques. The cyano group of the pyrazoles was found to be susceptible to hydrolysis during preparation.
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