Browsing by Author "Parameswaran, P.S."
Now showing items 1-20 of 67
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(-)-6 alpha hydroxy polyanthellian A - A novel antifouling diterpenoid from the Indian soft coral Cladiella krempfi (Hickson)
LimnaMol, V.P.; Raveendran, T.V.; Parameswaran, P.S.; Kunnath, R.J.; Rajamohanan, P.R. (NRC Research Press, 2011)Bioassay-guided purification of methanol extract of the soft coral Cladiella krempfi (Octocorallia: Alcynocea) yielded a novel eunicellin-type diterpenoid, (-)-6 alpha-hydroxy polyanthellin A (1), active against the cyprids ... -
A concise synthesis of (R)-Bgugaine, a pyrrolidine alkaloid from Arisarum vulgare
Majik, M.S.; Parameswaran, P.S.; Tilve, S.G. (Science Reviews 2000 Ltd, 2008)A new short method for the preparation of (R)-Bgugaine (1) has been described using Wittig condensation of a nonstabilised ylide with N-carboethoxy prolinal followed by reduction of double bond and conversion of N-carboethoxy ... -
A short synthesis-stuttgart of (S)-pyrrolam A via domino oxidation-witting reaction
Majik, M.S.; Shet, J.; Tilve, S.G.; Parameswaran, P.S. (Thieme, 2007)A short synthesis of (S)-pyrrolam A starting from readily available N-(benzyloxycarbonyl)-L prolinol is described that makes use of a domino primary alcohol oxidation-Witting reaction as the key step -
Active pharmaceutical ingredient (api) from an estuarine fungus, Microdochium nivale (Fr.)
Bhosale, S.H.; Patil, K.B.; Parameswaran, P.S.; Jagtap, T.G. (Triveni Enterprises, 2011)Various marine habitats sustain variety of bio-sources of ecological and biotech potentials. Pharmaceutical potential compound Cyclosporine A was reported from marine fungus Microdochium nivale associated with Porteresia ... -
An expeditious I sub(2)-catalyzed entry into 6H-indolo[2,3-b]quinoline system of cryptotackieine
Parvatkar, P.T.; Parameswaran, P.S.; Tilve, S.G. (American Chemical Society, 2009)A synthesis of a series of novel 6H-indolo[2,3-b]- quinolines with different substituents on the quinoline ring is described. The method involves reaction of indole-3-carboxyaldehyde with aryl amines in the presence of a ... -
Anti-bacterial compounds from the sponge Haliclona sp.
Parameswaran, P.S.; Kamat, S.Y.; Chandramohan, D.; Nair, S.; Das, B. (New Delhi: Oxford & IBH, 1992)The crude methanolic extract of the sponge Haliclona sp., collected off Gujarat coast exhibited promising anti-viral (in vitro, 75%) and anti-bacterial properties Partitioning of the extract between various organic solvents, ... -
Anti-influenza activity in the Indian seaweeds - A preliminary investigation
Chatterji, A.; Dhargalkar, V.K.; Sreekumar, P.K.; Parameswaran, P.S.; Rodrigues, R.; Kotnala, S. (National Institute of Ocean Technology, 2004)Antiviral activity in four commercially important seaweeds namely; Spatoglossum asperum J. Ag., Padina tetrastromatica Hauck, Sargassum tenerrimum J. Ag. and Stoechospermum marginatum (Ag.) Kuetz was studied on fragments ... -
Antifouling activity exhibited by secondary metabolites of the marine sponge, Haliclona exigua (Kirkpatrick)
LimnaMol, V.P.; Raveendran, T.V.; Parameswaran, P.S. (Elsevier, 2009)Bioassay guided purification of the acetone extract of the marine sponge, Haliclona exigua, (Gulf of Mannar, India) yielded a fraction rich in bis-1-oxaquinolizidine alkaloids, active against seven strains of fouling ... -
Antifouling activity of Indian marine invertebrate against the green mussel Perna viridis L.
PrabhaDevi; Jayasree, V.; Naik, C.G.; Parameswaran, P.S.; Raveendran, T.V.; Kamat, S.Y. (Springer, 1998)Thirty-one species of marine invertebrates collected from the Indian Coast, belonging to six phyla (Porifera, Coelenterata, Annelida, Mollusca, Echinodermata, and Eurochordata) were tested for antifouling activity against ... -
Antifouling sesquiterpene from the Indian soft coral, Sinularia kavarattiensis Alderslade and Prita
LimnaMol, V.P.; Raveendran, T.V.; Parameswaran, P.S.; Kunnath, R.J.; Sathyan, N. (NISCAIR, CSIR, 2010)A sesquiterpene, (1'E,5'E)-2-(2',6'-dimethylocta-1',5',7'-trienyl)-4-furoic acid [1], was isolated for the first time from the soft coral Sinularia kavarattiensis Alderslade & Prita collected from Gulf of Mannar (Tamil ... -
Bioactivity of marine organisms. 4. Screening of some marine animals from the Indian coast
Naik, C.G.; Kamat, S.Y.; Parameswaran, P.S.; Das, B.; Battacharya, J.; Ramani, P.; Bhakuni, D.S.; Goel, A.K.; Jain, S.; Srimal, R.C. (Indian Association for Limnology and Oceanography, 1989)Of twenty eight alcoholic extracts of marine organisms screened for a wide range of pharmacological activities, 15 showed biological activity. Of these two were anti implantation, 3 CNS stimulant, 2 hypotensive, 4 diuretic, ... -
Bioactivity of marine organisms. Part 5. Screening of some marine fauna from the Indian coast
Naik, C.G.; Kamat, S.Y.; Parameswaran, P.S.; Das, B.; Patel, J.; Ramani, P.; Bhakuni, D.S.; Goel, A.K.; Jain, S.; Srimal, R.C. (National Institute of Oceanography, India, 1990) -
Biological active anthraquinone analogs from the fungus Eurotium sp.
Parameswaran, P.S.; Gawas, D.; Tilvi, S.; Naik, C.G. (National Institute of Ocean Technology, 2004)Four known anthraquinones: Physcion, fluoroglaucin, catenarin and alaternin as well as a cyclic dipeptide with a triprenylated indole moiety, echinulin were purified from acetone extract of the mycelial mats of the fungus ... -
Bis(indolyl)methane alkaloids: Isolation, bioactivity, and syntheses
Praveen, P.; Parameswaran, P.S.; Majik, M.S. (Georg Thieme Verlag Stuttgart, 2015)Bis(indolyl)methane (BIM) alkaloids are an important group of bioactive natural products predominantly found in marine organisms. Thus, compounds like arsindoline A and B, vibrindole A, arundine, and trisindoline are found ... -
Calamenenes - aromatic bicyclic sesquiterpenes - from the Indian gorgonian Subergorgia reticulata (Ellis and Solander, 1786)
LimnaMol, V.P.; Raveendran, T.V.; Naik, B.G.; Kunnath, R.J.; Parameswaran, P.S. (Taylor & Francis, 2011)Three aromatic sesquiterpene derivatives, (+)-(7R, 10S)-2-methoxy calamenene (1), (+)-(7R, 10S)-2,5-dimethoxy calamenene (2) and (+)-(7R, 10S)-2-methoxy-5-acetoxy calamenene (3) were isolated from the methanol extract of ... -
Cascade Wittig reaction-double Claisen and Cope rearrangements: one-pot synthesis of diprenylated coumarins gravelliferone, balsamiferone, and 6,8-diprenylumbelliferone
Patre, R.E.; Shet, J.B.; Parameswaran, P.S.; Tilve, S.G. (Elsevier, 2009)A cascade Wittig reaction-double Claisen and Cope rearrangements has been employed for a one-pot synthesis of diprenylated coumarins gravelliferone, balsamiferone, and 6,8-diprenylumbelliferone from a common precursor ... -
Constituents of the brown alga Padina tetrastromatica (Hauck)-II
Parameswaran, P.S.; Naik, C.G.; Das, B.; Kamat, S.Y.; Bose, A.K.; Nair, M.S.R. (NISCAIR, CSIR, 1996)Three terpenoids, (2R,4S)-4-acetoxy-2-hydroxy-2,6,6-trimethylcyclohexanone (1), 3'R,4'-[(2R,4S)-4-acetoxy-2-hydroxy-2,6,6-trimethylcyclohexylidene] but-3'-en-2'-one or apo-9'-fucoxanthinone (2) and loliolide (3) have been ... -
Convenient synthesis of 2,2-Dimethyl-3,4-dihydro-2 H-pyrano[2,3- b]quinolines
Parsekar, S.B.; Amonkar, C.P.; Parameswaran, P.S.; Tilve, S.G. (Taylor & Francis, 2010)A convenient general synthesis of 2,2-dimethyl-3,4-dihydro-2H-pyrano[2,3-b]quinolines using the Wittig reaction is described. The o-nitrobenzaldehydes (1a-d) on reaction with phosphorane 2 provided (E)-ethyl-a-(2,2-dimet ... -
Convenient synthesis of volatile streptomyces lactones
Amonkar, C.P.; Tilve, S.G.; Parameswaran, P.S. (Thieme, 2005)A convenient three-step synthetic approach towards 3-alkyl-5-methyl-2[5H]furanones is described. The steps involved in the synthesis are domino primary alcohol oxidation-Wittig reaction, acid-catalysed lactonisation and ... -
Diversity and bioactive potentials of culturable heterotrophic bacteria from the surficial sediments of the Arabian Sea
Anas, A.; Nilayangod, C.; Jasmin, C.; Vinothkumar, S.; Parameswaran, P.S.; Nair, S. (Springer, 2016)Marine sediments accommodate plethora of diverse microorganisms with varying ecological functions. In the present study, we isolated bacteria from surficial sediments of south east Arabian Sea (AS) and evaluated their ...