ARISTOLACTAMS AND 4,5-DIOXOAPORPHINES FROM PIPER LONGUM

Article abstract of DOI:10.1016/0031-9422(88)80226-7

Nine alkaloids were isolated from the cold ethanol extract of Piper longum roots, of which six known compounds were identified as cepharadione B, cepharadione A, cepharanone B, aristolactam AII, norcepharadione B, and 2-hydroxy-1-methoxy-4H-dibenzoquinoline-4,5(6H)-dione.The three new alkaloids were characterized as 10-amino-4-hydroxy-3-methoxyphenanthrene-1-carboxylic acid lactam , 10-amino-4-hydroxy-2,3-dimethoxyphenanthrene-1-carboxylic acid lactam and 2-hydroxy-1-methoxy-6-methyl-4H-dibenzoquinoline-4,5(6H)-dione .Key Word Index - Piper longum; Piperaceae; root alkaloids; aristolactams; dioxoaporphines; piperolactam A; piperolactam B; piperadione; NMR.