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Methyl 8a-Formyloxy-labd-13Z-en-15-oate [(-)-(2Z)-5-((1R,2R,4aS,8aS)-2-Formyloxy-2,5,5,8a-tetramethyldecahydro-1-naphthalenyl)-3-methyl- 2-pentenoic Acid Methyl Ester]
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Department of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China.
Authors to whom correspondence should be addressed.
Molbank 2004, 2004(1), M375;
Received: 14 October 2003 / Accepted: 23 February 2004 / Published: 24 February 2004
Keywords: polypyridyl ligand; 2; 9-dimethyl-1; 10-phenanthroline; imidazole polypyridyl ligand; 2; 9-dimethyl-1; 10-phenanthroline; imidazole
Molbank 2004 m375 i001
2,9-dimethyl-1,10-phenanthroline-5,6-dione was synthesized by the procedure for the preparation of 1,10-phenanthroline-5,6-dione [1]. A mixture of 3,4-methylenedioxy- benzaldehyde (0.45 g, 3 mmol), 2,9-dimethyl-1,10-phenanthroline-5,6-dione (0.714 g, 3 mmol), ammonium acetate (4.62 g, 60 mmol) and glacial acetic acid (30 cm3) was refluxed with stirring at 130 oC for 2 hours. The cooled solution was filtered, diluted with water (ca, 40 cm3) and neutralized with concentrated aqueous ammonia. The orange precipitate was collected and purified by column chromatography on alumina with ethanol-toluene (16:1 v/v) as eluent. The title compound was obtained as amorphous yellow solid (0.52 g), Yield: 47%.
Elemental analysis: Found C, 71.48; H, 4.13; N, 14.97. Calc for C22H16N4O2 C, 71.73; H, 4.38; N, 15.21.
1H NMR (500 MHz, d6-DMSO): δ14.1 (br, s, 1H), 8.90 (d, 2H), 7.84 (m, 2H), 7.81 (d, 1H), 7.79 (d, 1H), 7.18 (d, 1H), 6.09 (s, 2H), 2.50 (s, 6H).
IR (KBr, cm-1): 542(w), 629(w), 731(w), 818(s), 871(w), 931(m), 1038(s), 1102(w), 1242(s), 1351(m), 1445(s), 1472(s), 1497(s), 1585(m), 1623(w), 2776(w), 2890(w), 3067(w).
FAB-MS ([M+1]+): 369.

Supplementary materials

Supplementary File 1Supplementary File 2Supplementary File 3


Support for this research provided by the National Natural Science Foundation of China, the National Science Foundation of Guangdong Province and Research Fund of Royal Society of Chemistry U.K. is gratefully acknowledged.


  1. Yamada, M.; Tanaka, Y.; Yoshimoto, Y.; Kuroda, S.; Shimao, I. Bull. Chem. Soc. Jpn. 1992, 65, 1006.
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