Planta Med 2018; 84(02): 129-134
DOI: 10.1055/s-0043-118102
Natural Product Chemistry and Analytical Studies
Original Papers
Georg Thieme Verlag KG Stuttgart · New York

Cytotoxic Flavones from the Stem Bark of Bougainvillea spectabilis Willd

Lien T.M. Do1, 2, Thammarat Aree1, Pongpun Siripong3, Nga T. Vo4, Tuyet T.A. Nguyen5, Phung K.P. Nguyen6, Santi Tip-pyang1
  • 1Center of Excellence in Natural Products Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
  • 2Sai Gon University, Ho Chi Minh City, Vietnam
  • 3Natural Products Research Section, National Cancer Institute, Bangkok, Thailand
  • 4Ho Chi Minh City University of Technology and Education, Ho Chi Minh City, Vietnam
  • 5Ho Chi Minh City University of Pedagogy, Ho Chi Minh City, Vietnam
  • 6University of Science, National University – Ho Chi Minh City, Ho Chi Minh City, Vietnam
Further Information

Publication History

received 12 February 2017
revised 15 July 2017

accepted 01 August 2017

Publication Date:
11 August 2017 (eFirst)


Five new flavones possessing a fully substituted A-ring with C-6 and C-8 methyl groups, bougainvinones I – M (15), along with three known congeners, 2′-hydroxydemethoxymatteucinol (6), 5,7,3′,4′-tetrahydroxy-3-methoxy-6,8-dimethylflavone (7) and 5,7,4′-trihydroxy-3-methoxy-6,8-dimethylflavone (8), were isolated from the EtOAc extract of the stem bark of Bougainvillea spectabilis. Their structures were established by means of spectroscopic data (ultraviolet, infrared, high-resolution electrospray ionization mass spectrometry, and one-dimensional and two-dimensional nuclear magnetic resonance) and single-crystal X-ray crystallographic analysis. The in vitro cytotoxicity of all isolated compounds against five cancer cell lines (KB, HeLa S-3, MCF-7, HT-29, and HepG2) was evaluated. Compound 5 showed promising cytotoxic activity against the KB and HeLa S-3 cell lines, with IC50 values of 7.44 and 6.68 µM. The other compounds exhibited moderate cytotoxicity against the KB cell line.

Supporting Information