ChemInform Abstract: Diterpenoids and Steroids from Taiwania Cryptomerioides

Five new diterpenes and four uncommon sterols were isolated from the leaves of Taiwania cryptomerioides. Their structures were determined by chemical, spectroscopic and X-ray diffraction methods. The terpenes are 8,9-epoxy-7-oxoroyleanone methyl ether, 1,13,14-trihydroxypodocarpa-8,11,13-trien-7-one, 7α,8α-dihydroxylabda-13(16),14-dien-19-yl cis-4-hydroxycinnamate, 7α,8α-dihydroxylabda-13(16),14-dien-19-yl trans-4-hydroxycinnamate and beyer-15-en-18-carboxy β- d -glucopyranoside pentaacetate. The sterols, namely taiwaniasterols A-D, exhibit an uncommon skeleton of 6-5-6-5 fused rings.