Isagarin, a new type of tetracyclic naphthoquinone from the roots of pentaslongiflora
A new type of tetracyclic naphthoquinone, named isagarin (1), was isolated from the hexane extract of the roots of Pentas longiflora. On the basis of spectral and X-ray diffraction analysis this compound was identified as 1,4-epoxy-4-methyl-1,2,4, 5-tetrahydronaphtho[2.3-d]oxepin-6,11-dione.
Van Puyvelde L
Department of Organic Chemistry, Faculty of Agricultural and Applied Biological Sciences, University of Ghent, Coupure Links 653, B-9000 Ghent, Belgium, and Laboratoire de Chimie Physique et de Cristallographie, Universite Catholique de Lo.
El Hady S
De Kimpe N
Feneau-Dupont
J
Declercq
JP