Two New 5-Deoxyflavonoids from Calliandra inermis

Abstract

Two new 5-deoxyflavonoids, 7,2′,3′,4′-tetramethoxyflavone (1) and 7,2′,3′,4′-tetramethoxyflavanone (2) together with a known flavone 7,4′-dimethoxy-3′-hydroxyflavone (3) were isolated from the whole plant of Calliandra inermis. The structures of these new compounds were elucidated by high resolution electron impact mass spectrometry (HR-EI-MS) and 1D and 2D-NMR spectral studies including ¹H–¹H correlation spectroscopy (COSY), heteronuclear single quantum coherence (HSQC), heteronuclear multiple bond connectivity (HMBC) and nuclear Overhauser enhancement spectroscopy (NOESY).