A new naphthoquinone from Ceiba pentandra

Abstract

A new naphthoquinone, 2,7-dihydroxy-8-formyl-5-isopropyl-3-methyl-1,4-naphthoquinone (1) together with a known naphthoquinone, 8-formyl-7-hydroxy-5-isopropyl-2-methoxy-3-methyl-1,4-naphthoquinone (2), has been isolated from the heartwood of Ceiba pentandra. The structures of 1 and 2 have been elucidated by extensive 1D and 2D NMR experiments.

Keywords:

• Bombacaceae
• Naphthoquinones

Acknowledgements

The authors thank Dr J. P. Brouard, Laboratoire de Chimie des Substances Naturelles, MNHN, Paris, France, for providing mass spectral data.