S
Sunil Kumar Talapatra
Researcher at University of Calcutta
Publications - 89
Citations - 792
Sunil Kumar Talapatra is an academic researcher from University of Calcutta. The author has contributed to research in topics: Diterpene & Michelia. The author has an hindex of 16, co-authored 85 publications receiving 747 citations.
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(−)-Regiolone, an α-tetralone from Juglans regia: structure, stereochemistry and conformation
TL;DR: In this paper, a new α-tetralone derivative named (−)-regiolone has been isolated with juglone, betulinic acid and sitosterol from the stem-bark of Juglans regia.
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Pongaglabol, a new hydroxyfuranoflavone, and aurantiamide acetate, a dipeptide from the flowers of Pongamia glabra
TL;DR: The structure of pongaglabol has been established as 5-hydroxyfurano(8,7-4″,5″)flavone on the basis of spectral and chemical evidence.
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Isopongaglabol and 6-methoxyisopongaglabol, two new hydroxyfuranoflavones from Pongamia glabra
TL;DR: The structures of isopongglabol and 6-methoxyisopongaglabol have been established as 4′-hydroxyfurano(8,7-4″,5″)flavone and 4′ -hydroxy-6- methoxyfurano (8, 7-4′, 5″)Flavone, respectively, on the basis of the spectral evidence and they have been confirmed by synthesis.
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Two pentacyclic triterpenes from Rubia cordifolia
TL;DR: Rubicoumaric acid and rubifolic acid isolated from Rubia cordifolia have been shown to be 30-hydroxy-3β-p-Hydroxycoumaryloxy-urs-12-ene-28-oic acid or 3β,30-dihydroxy-urs 12-ene,28- oic acid respectively on the basis of 1H NMR, 13C NMR and mass spectral and chemical evidence.