Dihydroflavonols from Lannea coromandelica

• Published in: Phytochemistry (Oxford) Vol. 54; no. 8; pp. 901 - 907
• Main Authors: Tofazzal Islam, Md, Tahara, Satoshi
• Format: Journal Article
• Language: English
• Published: OXFORD Elsevier Ltd 01.08.2000; Elsevier
• Subjects: (2 R,3 R)-(+)-4′,5,7-trimethoxydihydroflavonol; Biochemistry & Molecular Biology; Biological and medical sciences; Chemical constitution; cis-type Dihydroflavonol, (2 R,3 S)-(+)-3′,5-dihydroxy-4′,7-dimethoxydihydroflavonol; Flavonoids - chemistry; Flavonoids - isolation & purification; Fundamental and applied biological sciences. Psychology; Isolation; Lannea coromandelica L. (Anacardiaceae); Life Sciences & Biomedicine; Molecular Structure; Plant physiology and development; Plant Sciences; Rosales - chemistry; Science & Technology; Spectrum Analysis; Structure elucidation; Asia; Bangladesh; Lannea coromandelica L. (Anacardiaceae); Isolation; (2 R,3 R)-(+)-4′,5,7-trimethoxydihydroflavonol; cis-type Dihydroflavonol, (2 R,3 S)-(+)-3′,5-dihydroxy-4′,7-dimethoxydihydroflavonol; Structure elucidation; FLAVANONE; GLYCOSIDES; CONFIGURATION; LEAVES; (2R,3S)-(+)-3 ',5-dihydroxy-4 ',7-dimethoxydihydroflavonol; isolation; FLAVONOIDS; cis-type Dihydroflavonol; SIEB; ACIDA; (2R,3R)-(+)-4 ',5,7-trimethoxydihydroflavonol; structure elucidation; Folk medicine; Molecular structure; Dicotyledones; Angiospermae; Bark; Spermatophyta; Flavonoid; Stem; Anacardiaceae; Medicinal plant
• ISSN: 0031-9422; 1873-3700
• DOI: 10.1016/S0031-9422(00)00048-0

The dihydroflavonols, (2 R,3 S)-(+)-3′,5-dihydroxy-4′,7-dimethoxydihydroflavonol and (2 R,3 R)-(+)-4′,5,7-trimethoxydihydroflavonol were isolated from the stem bark of Lannea coromandelica, along with the known (2 R,3 R)-(+)-4′,7-di- O-methyldihydroquercetin, (2 R,3 R)-(+)-4′,7-di- O-methyldihydrokaempferol and (2 R,3 R)-(+)-4′- O-methyldihydroquercetin. All five compounds were isolated for the first time from the genus Lannea; furthermore, (2 R,3 S)-(+)-3′,5-dihydroxy-4′,7-dimethoxydihydroflavonol, was a rare cis-type isomer. The structures of all compounds were elucidated by spectroscopic methods including 2D NMR and CD analysis.