Structure of wightionolide: chemical and X-ray analysis
作者:Balawant S. Joshi、Venkatesh N. Kamat、Tuticorin R. Govindachari、B. Ramachandra Pai、Gopinath Kartha、Kuan Tee Go
DOI:10.1039/p19740002517
日期:——
Wightionolide isolated from the leaves of Andrographiswightiana Arn. ex Nees is shown to be 17,19,20-trihydroxy-5β,8αH,9βH,10α-labd-13-en-16,15-olactone (XII). The molecular structure of the dibromo-triacetate (V) of wightionolide has been determined by X-ray diffraction studies.
Isolation and structure of wightional and wightiolide from Andrographis wightiana
作者:Balawant S. Joshi、Vinod R. Hegde、Venkatesh N. Kamat
DOI:10.1016/0031-9422(95)00946-9
日期:1996.6
Abstract Two new ent -labdane-type diterpenoids, wightional and wightiolide have been isolated from the leaves of Andrographiswightiana . Their structures were determined on the basis of extensive 1 H and 13 C, 1 H homonuclear COSY, and HMBC NMR spectroscopic studies. To correlate the newly isolated diterpenes with wightionolide, a number of derivatives of wightionolide have been prepared and characterized