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4 results on '"H. Chandrasiri Fernando"'

1. 1H and 13C NMR spectral assignments of some ene-quinonemethide nortriterpenoids

Author

A. A. Leslie Gunatilaka, H. Chandrasiri Fernando, Tohru Kikuchi, and Yasuhiro Tezuka

Subjects
Stereochemistry, Chemistry, Molecule, Plant Science, General Medicine, Fluorine-19 NMR, Horticulture, Carbon-13 NMR, Molecular Biology, Biochemistry, Ene reaction, Terpenoid
Abstract

The 1 H and 13 C NMR spectra of three natural 14(15)-ene-quinonemethide nortriterpenoids, balaenonol, balaenol and isobalaendiol have been comple

Published
1993
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2. 1H and13C NMR analysis of three quinone-methide triterpenoids

Author

A. A. Leslie Gunatilaka, H. Chandrasiri Fernando, Tohru Kikuchi, and Yasuhiro Tezuka

Subjects
chemistry.chemical_classification, chemistry.chemical_compound, Triterpenoid, chemistry, Triterpene, Stereochemistry, Proton NMR, Chemical solution, General Materials Science, General Chemistry, Nuclear magnetic resonance spectroscopy, Carbon-13 NMR, Quinone methide
Abstract

Detailed analysis of the 1H and 13C NMR spectra of three natural quinone-methide triterpenoids, pristimerin, tingenone and 20-hydroxytingenone, was carried out by the application of two-dimensional 1H1H and 1H13C shift correlation techniques. Some previous 1H and 13C assignments have been revised.

Published
1989
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3. Two new quinone-methides from cassine balae: Revised structure of balaenonol

Author

Gamini Weeratunga, A. A. Leslie Gunatilaka, H. Chandrasiri Fernando, Tohru Kikuchi, Yasuhiro Tezuka, and Vijaya Kumar

Subjects
chemistry.chemical_classification, biology, Stereochemistry, Organic Chemistry, biology.organism_classification, Biochemistry, Combinatorial chemistry, Quinone, NMR spectra database, Celastraceae, Heteronuclear molecule, Triterpene, chemistry, Drug Discovery, Molecule, Spectral data
Abstract

The structure of balaenol, a new quinone-methide triterpene isolated from Cassine balae has been deduced as 1 and the structure of the previously isolated balaenonol has been revised as 2 from their spectral data including 2-D heteronuclear 1H13C shift correlated NMR spectra and n.O.e studies.

Published
1988
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4. Studies on terpenoids and steroids - 18 balaenonol, balaenol and isobalaendiol: Three new 14(15)-ene-quinone-methide triterpenoids from cassine balae

Author

A. A. Leslie Gunatilaka, Tohru Kikuchi, Yasuhiro Tezuka, and H. Chandrasiri Fernando

Subjects
chemistry.chemical_classification, biology, Chemistry, Stereochemistry, medicine.medical_treatment, Organic Chemistry, biology.organism_classification, Biochemistry, Quinone methide, Terpenoid, Steroid, Celastraceae, chemistry.chemical_compound, Triterpenoid, Triterpene, Drug Discovery, medicine, Ene reaction
Abstract

The three new 14(15)-ene-quinone-methide triterpenoids, balaenonol, balaenol and isobalaendiol, isolated from Cassine balae have been shown to be 3,21β-dihydroxy-2,22-dioxo-3,5,7,10(1),14(15)-pentaen-(14→15)-D:A-friedo-24,29-dinoroleanane (1), 3,21β-dihydroxy-2-oxo-3,5,7,10(1),14(15)-pentaen-(14→15)-D:A-friedo-24,29-dinoroleanane (2) and 3,21β,22β-trihydroxy-2-oxo-3,5,7,10(1),14(15)-pentaen-(14→15)-D:A-friedo-24,30-dinoroleanane (3), respectively, on the basis of spectroscopic evidence. The possible biosynthetic origin of these 14(15)-ene-quinone-methides from pristimerin is discussed.

Published
1989
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