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Molecules 2012, 17(12), 13910-13916; doi:10.3390/molecules171213910
Article

A New Prenylated Naphthoquinoid from the Aerial Parts of Clinopodium chinense (Benth.) O. Kuntze

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Received: 19 October 2012 / Revised: 16 November 2012 / Accepted: 19 November 2012 / Published: 23 November 2012
(This article belongs to the Section Metabolites)
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Abstract

A new prenylated naphthoquinoid, named (3R,4aR,10bR)-3,10-dihydroxy-2,2-dimethyl-3,4,4a,10b-tetrahydro-2H-naphtho[1,2-b]-pyran-5H-6-one (1), was isolated from the aerial parts of Clinopodium chinense (Benth.) O. Kuntze, together with six known compounds: apigenin (2), luteolin (3), neoeriocitrin (4), naringenin (5), narirutin (6), and didymin (7). Neoeriocitrin was isolated for the first time from the species C. chinense. Their structures were elucidated by spectroscopic methods, including 1D, 2D (1H-1H-COSY, HSQC, HMBC and NOESY) NMR, HR-ESI-MS. The absolute configuration of 1 was determinated using the CD method. We highlight that the structure of 1 is characterized by a rarely seen prenylated naphthoquinoid framework.
Keywords: Clinopodium chinense (Benth.) O. Kuntze; prenylated naphthoquinoid; (3R,4aR,10bR)-3,10-dihydroxy-2,2-dimethyl-3,4,4a,10b-tetrahydro-2H-naphtho[1,2-b]-pyran- 5H-6-one; CD Clinopodium chinense (Benth.) O. Kuntze; prenylated naphthoquinoid; (3R,4aR,10bR)-3,10-dihydroxy-2,2-dimethyl-3,4,4a,10b-tetrahydro-2H-naphtho[1,2-b]-pyran- 5H-6-one; CD
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Zhong, M.; Sun, G.; Zhang, X.; Sun, G.; Xu, X.; Yu, S. A New Prenylated Naphthoquinoid from the Aerial Parts of Clinopodium chinense (Benth.) O. Kuntze. Molecules 2012, 17, 13910-13916.

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