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IJC-B Vol.47B(12) December 2008] >


Title: Radermachol and naphthoquinone derivatives from Tecomella undulata: Complete ¹H and ¹³C NMR assignments of radermachol with the aid of computational ¹³C shift prediction
Authors: Singh, Pahup
Khandelwal, Poonam
Hara, Noriyuki
Asai, Teigo
Fujimoto, Yoshinori
Keywords: Radermachol
2-isopropenylnaphtho[2,3-b]furan-4,9-quinone
chemical shift prediction
Tecomella undulata
computational chemistry
Issue Date: Dec-2008
Publisher: CSIR
Abstract: Petroleum ether extract of the heartwood of Tecomella undulata affords radermachol, an unusual rare pigment and 2-isopropenylnaphtho[2,3-b]furan-4,9-quinone along with lapachol, tecomaquinone-I, dehydro-α-lapachone, α-lapachone, β-lapachone, cluytyl ferulate, stigmasterol and β-sitosterol. Radermachol and 2-isopropenylnaphtho [2,3-b]furan-4,9-quinone are being reported for the first time from genus Tecomella. Complete assignments of ¹H and ¹³C NMR signals of polyketide, radermachol 1, have been achieved by the ¹³C NMR chemical shift prediction using ab initio MO and DFT/GIAO methods in addition to 2D-NMR techniques.
Page(s): 1865-1870
ISSN: 0376-4699
Source:IJC-B Vol.47B(12) December 2008]

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