Indole alkaloids from Tabernaemontana pandacaqui in the Philippines

Biochemical Systematics and Ecology
1993.0

Abstract

The stems and leaves of Tabernaemontana pandacaqui Poir. collected at Mindro, the Philippines in February 1990 were studied. From the air-dried stems, six alkaloids—tabernaemontanine (1), ervatamine (2), voacangine (3), voacristine (4), voaluteine (5), and pandine (6)—were obtained by MeOH percolation, fractionation, and silica gel column chromatography. Six alkaloids from the air-dried leaves were identified as 3, 4, 6, akuammicine (7), vallesamine (8), and vallesamine 17-O-acetate (9). The structures were all identified based on ¹H and ¹³C-NMR and MS considerations. The major alkaloid was 1 in the stems and 7 in the leaves. More than 80 alkaloids have been known from 39 Tabernaemontana species; the nine alkaloids in this study were all known but were the first report from this species except for 3. Neither lochneridine nor bistype alkaloids such as ervafoline were obtained from this plant material.

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