Diterpene acids from Mikania sp. nov (Asteraceae)

Phytochemistry, 1997

Two new ent-kaurane diterpenes, 18,19-diacetoxy-en t-kaur-16-ene and 17-oxo-en t-kaur-15(16', 18-oic acid, were isolated from the aerial parts of Mikania banisteriae, together with the known ent-kaur ent-kaur-16-en-18-oic acid and ent-kaur-16-en-18-ol. The structures were established by mass spectrom4 1H NMR and partly ~3C NMR spectroscopy. In addition, the sesquiterpene lactones eudesma-4(15),7(1 l)-c 8/3,12-olide and eudesma-4(15),7(11),8(9)-trien-12-olide as well as the sesquiterpenes 1/3,6:t-dihydroxyeu& 4(15)-ene and caryophyllenoxide were identified by direct comparison (TLC, GC, GC-MS) with auth~ samples. The chemotaxonomic significance is briefly discussed, ent-Kaur-16-en-18-oic acid and ent-kaux en-19-oic acid showed no antifeedant, antimicrobial and antiinflammatory properties. ':D

Phytochemistry, 1988

Journal of Agricultural and Food Chemistry, 2005

Eighteen triterpene saponins (1-18) from Medicago arborea leaves have been isolated and their structures elucidated by spectroscopic, spectrometric (1D and 2D NMR, FAB-MS, ESI-MS/MS), and chemical methods. They have been identified as glycosides of medicagenic, zanhic, and 2hydroxyoleanolic acids, soyasapogenol B, bayogenin, and 2 ,3 -dihydroxyolean-12-en-23-al-28-oic acid. Twelve of them, identified as 3--side}medicagenic acid (18), are reported as new natural compounds. The presence of the aldehydic group on the sapogenin moiety of saponin 10 is discussed in the framework of a possible elucidation of the biosynthesis of these metabolites.

Phytochemistry, 1998

the aerial parts of Mikania uitifolia three new ent-kaurane diterpenes, ent-7cc-cinnamoyloxy-1 SD-hydroxy-kaur-I 6-en-19-oic acid, ent-I SP-cinnamoyloxy-7a-hydroxy-kaur-16-en-19-oic acid and em-1 S/?hydroxy-7cc-(E)-lachnophylloyloxy-kaur-16-en-19-oic acid were isolated together with the known ent-kauranes ent-kaur-16-en-19-oic acid, ent-kaur-16-en-19-01, ent-15fi-hydroxy-kaur-16-en-19-oic acid and ent-15gcinnamoyloxy-kaur-16-en-19-oic acid. The structures were established by mass spectrometry, 'H NMR and partly "C NMR spectroscopy.

Phytochemistry, 1998

Journal of the Brazilian Chemical Society, 2005

A investigação química das folhas de Minasia alpestris forneceu dois novos furanoeliangolidos, bem como sete lactonas sequiterpênicas conhecidas. As estruturas foram elucidadas através de métodos espectroscópicos.

Phytochemistry, 1986

Phytochemisiry. Vol. 25, No. 5, pp. 1240-1242, 1986. Printed in Great Britain. 0031-9422/86 $3.00+0.00 ) 1986PergamonPress Ltd. PIMARADIENE DITERPENES FROM MIKANIA TRIANGULARIS* FERNANDA S. KNUDSEN, WAGNER VILEGAS, FERNANDO ...

Phytochemistry, 1990

Phytochemistry, 1991

Natural Product Letters, 2001

M im usops elengi, Sapotaceae, Triterpenes Two new triterpenes, 3/3,19a,23-trihydroxy-urs-12-ene (1) and 3/3-(p-hydroxy-c/s-cinnamoyloxy)urs-12-en-28-oic acid (2) have been isolated from the methanolic extract o f M im usops elengi along with 3/3-(p-hydroxy-rra«s-cinnamoyloxy)urs-12-en-28-oic acid (3), which has been obtained for the first time from this species, and ursolic acid (4), respectively. Their structures were established through chemical and spectral studies. Compounds (3) and (4) were found to exhibit potent inhibitory activity against a-glucosidase enzyme.