Neue germacranolide aus Calea urticifolia
1979; Elsevier BV; Volume: 18; Issue: 1 Linguagem: Inglês
10.1016/s0031-9422(00)90927-0
ISSN1873-3700
AutoresFerdinand Bohlmann, Jasmin Jakupovic,
Tópico(s)Phytochemistry and Biological Activities
ResumoThe investigation of Calea urticifolia afforded eight new germacranolides. While five are heliangolides, three are of a new type and have some unusual structural features. The structures are elucidated by extensive 1H-NMR studies and some chemical transformations. In addition, a new isoeugenol and an unusual phloroglucinol derivative were isolated; the structure of the latter could only be established after some chemical transformations. Other Calea species contain typical C17 acetylenes only, also present in other species of the subtribe Galinsoginae. So far, the results on Calea indicate that the genus is chemically heterogenous.
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