Chemical Constituents of Flavones Part from the Stems and Leaves of Alpinia oxyphylla Miq.
To study the chemical constituents of flavones from the stems and leaves of Alpinia oxyphylla Miq. The chemical constituents were isolated by using various column chromatographies and their structures were elucidated on basis of physicochemical constants and spectral data analysis. Consequently,eight flavones and three flavanones were obtained from the 95% ethanol extracts of the stems and the leaves of Alpinia oxyphylla Miq. Their structures were determined to be izalpinin( 1),tectochrysin( 2),chrysin( 3),apigenin( 4),acacetin( 5),5 hydroxy 4',7 dimethoxyflavone( 6),kaempferol 4' O methylether( 7),5,7,4' trimethoxyflavone( 8),pinocembrin( 9),pinostrobin( 10),and dihydrokaempferol( 11) All those compounds were obtained from the parts of stems and leaves of A. oxyphylla Miq. for the first time,and compounds 6,8,and 10 were obtained from this genus for the first time.