Preparations and Antileukemic Activity of Congeners of Tropoloisoquinoline Alkaloids from Abuta concolor
摘要:
Antileukemic tropoloisoquinoline alkaloids, pareirubine A (1) and grandirubrine (2), at first have been isolated from Abuta concolor (Menispermaceae). Methylation of 1 and 2, existing in solution as a mixture of tautomers gave the corresponding four methyl derivatives (3 - 6). Thioimerubrine (7) and thioisoimerubrine (8) were prepared by the nucleophilic substitutions of the methoxyl groups at C-11 and -10, respectively. Acetylation of 1 and 2 produced the corresponding mono-acetyl tautomers (9 and 10). Antileukemic activity of these derived tropoloisoquinoline alkaloids is also reported.