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Molbank 2009, 2009(4), M626; doi:10.3390/M626

Short Note
(S*)-2,7,8-Trihydroxychroman-4-one
Ming-Jen Cheng 1, Wen-Li Lo 2, Hung-Chun Yeh 3 and Chung-Yi Chen 2,*
1
Bioresource Collection and Research Center (BCRC), Food Industry Research and Development Institute (FIRDI), Hsinchu, Taiwan
2
School of Medical and Health Sciences, Fooyin University, Kaohsiung County, Taiwan
3
Department of Medical Technology, Fooyin University, Kaohsiung County, Taiwan
*
Author to whom correspondence should be addressed; Tel.: +886-7-7811151 ex 6200; Fax: +886-7-7834548.
Received: 21 September 2009 / Accepted: 8 October 2009 / Published: 9 October 2009

Abstract

:
Reticumanone (1), a new chromanone, isolated from the leaves of Cinnamomum reticulatum Hay (Lauraceae), has been characterized as (S*)-2,7,8-trihydroxychroman-4-one, by means of spectroscopic methods.
Keywords:
Cinnamomum reticulatum Hay; Lauraceae; reticumanone; chromanone

1. Introduction

The Cinnamoum species (Lauraceae) have been used in folk medicine for sweating, antipyretic, and analgesic effect [1]. There is only one paper describing the constituents of Cinnamomum reticulatum Hay [1]. In the course of screening for biologically and chemically novel agents from Formosan Lauraceous plants [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17], C. reticulatum Hay was chosen for further phytochemical investigation. In this paper, we report the isolation and structural elucidation of this new chromanone compound (1).

2. Results and Discussion

Reticumanone (1), obtained as a white amorphous powder (CHCl3), was assigned the molecular formula C9H8O5 by HR-EIMS at m/z [M]+ 196.0374 (calcd for C9H8O5, 196.0372). UV λmax at 273, 310 (sh), 322 nm, IR bands at 1660 cm-1 and a signal appearing at δ 182.4 in the 13C-NMR spectrum indicate the chromanone skeleton of this compound [18]. The IR spectrum revealed the presence of a hydroxyl group absorption at ν 3400 cm-1. The 1H-NMR spectrum of 1 showed one set of AB doublet signals at δ 6.81 (1H, d, J = 8.8), and 7.31 (1H, d, J = 8.8), one methine proton at δ 5.32 (1H, dd, J = 9.0, 3.4), and two methylene protons at δ 2.67 (1H, dd, J = 16.8, 9.0)/3.08 (1H, dd, J = 16.8, 3.4), indicating that 1 was probably a 2,7,8-trihydroxychroman-4-one. The 13C-NMR spectrum indicated that compound 1 had a total of 9 carbons, with the skeleton consisting of a chroman-4-one. The carbons of the chroman-4-one were assigned, from 13C-NMR and DEPT experiments, one methylene at δ 45.9 (C-3); three methines at δ 92.4 (C-2), 126.8 (C-6) and 131.4 (C-5); and five quaternary carbons at δ 111.8 (C-4a), 135.7 (C-8), 150.6 (C-8a), 152.1 (C-7) and 182.9 (C-4). The structure of 1 was also confirmed by 2D NMR experiments. A COSY correlation was observed between H-2 and H-3, and between H-5 and H-6 (Figure 1). The HETCOR experiment showed that the carbon signals at δ 92.4 for C-2, 45.9 for C-3, 131.4 for C-5 and 126.8 for C-6 were correlated to the proton signals at δ 5.32 for H-2, 2.67/3.08 for H-3, 7.31 for H-5 and 6.81 for H-6, respectively. The relative configuration of 1 was determined by 2D NOESY analysis. The observation of the NOESY correlation from H-3eq. to H-2 suggested that H-2 was in the β–configuration (Figure 2). Thus, the structure of 1 was determined to be (S*)-2,7,8-trihydroxychroman-4-one and has been named reticumanone.

3. Experimental

3.1. General

UV spectra were obtained on a Jasco UV-240 spectrophotometer in CH3CN, IR spectra were measured on a Hitachi 260-30 spectrophotometer. 1H NMR (400 MHz), HETCOR, HMBC, COSY, NOESY, and DEPT spectra were obtained on a Varian (Unity Plus) NMR spectrometer. Low-resolution EIMS spectra were collected on a Jeol JMS-SX/SX 102A mass spectrometer or Quattro GC/MS spectrometer having a direct inlet system. High-resolution EIMS spectrum was measured on a Jeol JMS-HX 110 mass spectrometer. Silica gel 60 (Merck, 70~230 mesh, 230~400 mesh) was used for column chromatography. Precoated Silica gel plates (Merck, Kieselgel 60 F-254), 0.20 mm and 0.50 mm, were used for analytical TLC and preparative TLC, respectively, visualized with 50% H2SO4.

3.2. Plant Material

The leaves of C. reticulatum Hay were collected from Pingtung County, Taiwan, May 2005. Plant material was identified by Professor Fu-Yuan Lu (Department of Forestry and Natural Resources College of Agriculture, National Chiayi University). A voucher specimen (Cinnamo. 6) was deposited in the School of Medical and Health Sciences, Fooyin University, Kaohsiung County, Taiwan.

3.3. Extraction and Isolation

The air-dried leaves of C. reticulatum Hay (3.4 kg) were extracted with n-hexane (30 L × 5) and CHCl3 (30 L × 5) at room temperature and a n-hexane extract (43.5 g) and CHCl3 extract (151.5 g) were obtained upon concentration under reduced pressure. The n-hexane extract (43.5 g) was chromatographed over silica gel (980 g, 70−230 mesh) using n-hexane/EtOAc/Acetone mixtures as eluents to produce five fractions. Part of fraction 4 (10.62 g) was subjected to silica gel chromatography by eluting with CHCl3-MeOH (60:1), enriched with MeOH to furnish five further fractions (4-1−4-5). Fraction 4-2 (2.56 g) was further purified on a silica gel column using CHCl3-MeOH mixtures to obtain reticumanone (4 mg).
Reticumanone ((S*)-2,7,8-trihydroxychroman-4-one) (1): White amorphous powder (CHCl3); [α]25D–12.6° (c 0.005, CHCl3); UV/Vis (CH3CN): λmax (log ε): 273 (3.62), 310 (sh), 322 (3.00) nm; IR (neat) νmax: 3400 (br, OH), 2920, 2850, 1660 (C=O), 1250 cm-1; MS (EI, 70 eV): m/z (%): 196 [M]+ (45), 179 (57), 163 (64), 147 (100), 90 (32); HR-MSEI: m/z [M]+ calcd for C9H8O5: 196.0372; found: 196.0374; 1H NMR (400 MHz, CDCl3) δ 2.67 (1H, dd, J = 16.8, 9.0 Hz, H-3ax.), 3.08 (1H, dd, J = 16.8, 3.4 Hz, H-3eq.), 5.32 (1H, dd, J = 9.0, 3.4 Hz, H-2), 6.81 (1H, d, J = 8.8 Hz, H-6), 7.31 (1H, d, J = 8.8 Hz, H-5); 13C NMR (100 MHz, CDCl3): 45.9 (C-3, CH2), 92.4 (C-2, CH), 111.8 (C-4a, C), 126.8 (C-6, CH), 131.4 (C-5, CH), 135.7 (C-8, C), 150.6 (C-8a, C), 152.1 (C-7, C), 182.9 (C-4, C).

Supplementary materials

Supplementary File 1Supplementary File 2Supplementary File 3

Acknowledgments

This investigation was supported by a grant from the National Science Council of Republic of China (NSC-97-2320-B-242-002-MY3).

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Figure 1. COSY and HMBC Correlation of reticumanone (1).
Figure 1. COSY and HMBC Correlation of reticumanone (1).
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Figure 2. NOESY Correlations of reticumanone (1).
Figure 2. NOESY Correlations of reticumanone (1).
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