title: Two new homoisoflavonoids from Caesalpinia pulcherrima.
abstract: Two new homoisoflavonoids, (E)-7-methoxy-3-(4'-methoxybenzylidene)chroman-4-one (1) and (E)-7-hydroxy-3-(3',4',5'-trimethoxybenzylidene)chroman-4-one (5), along with three known homoisoflavonoids (Z)-7-hydroxy-3-(4'-methoxybenzylidene)chroman-4-one (isobon ducellin) (2), (E)-7-hydroxy-3-(4'-methoxybenzylidene)chroman-4-one (bonducellin) (3) and (E)-7-hydroxy-3-(2',4'-dimethoxybenzylidene)chroman-4-one (4) were isolated from the whole plant of Caesalpinia pulcherrima. The structures of these new compounds were elucidated by electron impact mass spectrometry (EI-MS) and 1D and 2D-NMR spectral studies. Antimicrobial activity of the new compounds was evaluated.
authors.affiliation: Natural Products Division, Department of Chemistry, Sri Venkateswara University, Tirupati-517 502, India.
authors.forename: Muchchintala
authors.initials: M
authors.lastname: Maheswara
authors.forename: Vidavalur
authors.initials: V
authors.lastname: Siddaiah
authors.forename: Chunduri
authors.initials: C
authors.lastname: Venkata Rao
mesh_terms: D000890:Anti-Infective Agents / Q000737:chemistry; D001597:Benzylidene Compounds / Q000737:chemistry* / Q000494:pharmacology; D029911:Caesalpinia / Q000737:chemistry*; D002867:Chromones / Q000737:chemistry* / Q000494:pharmacology; D005419:Flavonoids / Q000737:chemistry* / Q000494:pharmacology; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: C513998:7-hydroxy-3-(3',4',5'-trimethoxybenzylidene)chroman-4-one; C513997:7-methoxy-3-(4'-methoxybenzylidene)chroman-4-one; D000890:Anti-Infective Agents; D001597:Benzylidene Compounds; D002867:Chromones; D005419:Flavonoids