Flavonoids from Lonchocarpus araripensis (Leguminoseae) - isolation, unequivocal assignment of NMR signals ¹H and 13C and conformational analysis

Química Nova

Braz-Filho, Raimundo¹  Monte, Francisco José Q.¹  Ferreira, Daniele A.¹  Lima, Almi F.¹  Universidade Estadual do Norte Fluminense, Campo dos Goytacazes, Brasil¹  Universidade Federal do Ceará, Fortaleza, Brasil¹ 

关键词: Lonchocarpus araripensis;    Leguminosae;    flavonoids;    NMR data;    conformational analysis.;   

DOI  :  10.5935/0100-4042.20140109

学科分类：化学（综合）

来源: Sociedade Brasileira de Quimica

【 摘 要 】

In a continuing investigation for potentially bioactive natural products, flavonoids were isolated from Lonchocarpus araripensis (Leguminoseae) and identified as 3-methoxy-6-O-prenyl-6'',6''-dimethylchromene-[7,8,2'',3'']-flavone (1), 3,6-dimethoxy-6'',6''-dimethylchromene-[7,8,2'',3'']-flavone (2) and 3,5,8-trimethoxy-[6,7,2",3"]-furanoflavone (3). This is the first time compound 3 has been described. Compound 2 has been previously isolated from roots while this is the first time 1 is reported in this species. Complete NMR assignments are given for1 ,2 and 3 together with the determination of conformation for 1.

【 授权许可】

Unknown