Sebastianines A and B, Novel Biologically Active Pyridoacridine Alkaloids from the Brazilian Ascidian Cystodytes dellechiajei
摘要:
Fractionation of the crude methanol extract of the ascidian Cystodytes dellechiajei collected in Brazil yielded two novel alkaloids, sebastianine A (1) and sebastianine B (2). The structures of both 1 and 2 were established by analysis of spectroscopic data, indicating an unprecedented ring system for both compounds, comprising a pyridoacridine system fused with a pyrrole unit in sebastianine A (1) and a pyridoacridine system fused with a pyrrolidine system condensed with alpha-hydroxyisovaleric acid in sebastianine B (2). Both alkaloids displayed a cytotoxic profile against a panel of HCT-116 colon carcinoma cells indicative of a p53 dependent mechanism.
The synthesis of the marinealkaloid sebastianine A and of a regioisomer has been accomplished via hetero-Diels–Alder reaction of indole-4,7-dione or N-tosylindole-4,7-dione with trifluoroacetamidocinnamaldehyde dimethylhydrazone, and subsequent cyclisation in alkaline conditions.
Sebastianines A and B, Novel Biologically Active Pyridoacridine Alkaloids from the Brazilian Ascidian <i>Cystodytes </i><i>d</i><i>ellechiajei</i>
作者:Yohandra R. Torres、Tim S. Bugni、Roberto G. S. Berlinck、Chris M. Ireland、Alviclér Magalhães、Antonio G. Ferreira、Rosana Moreira da Rocha
DOI:10.1021/jo011174h
日期:2002.7.1
Fractionation of the crude methanol extract of the ascidian Cystodytes dellechiajei collected in Brazil yielded two novel alkaloids, sebastianine A (1) and sebastianine B (2). The structures of both 1 and 2 were established by analysis of spectroscopic data, indicating an unprecedented ring system for both compounds, comprising a pyridoacridine system fused with a pyrrole unit in sebastianine A (1) and a pyridoacridine system fused with a pyrrolidine system condensed with alpha-hydroxyisovaleric acid in sebastianine B (2). Both alkaloids displayed a cytotoxic profile against a panel of HCT-116 colon carcinoma cells indicative of a p53 dependent mechanism.