Macrophyllic acid from the heartwood of Podocarpus macrophyllus has been shown to be the bisditerpenoid dicarboxylic acid (I, R H) related to podototarin, and its di-O-methyl dimethyl ester synthesized from 16-hydroxytotarol. Podototarin (IV, R CH3) has been prepared by a one-step enzymatic coupling of (+)-totarol and the coupling reaction extended to the preparation of the lithiumaluminumhydride reduction
Rotatory dispersion and circular dichroism studies of some α-tetralones
作者:R.C. Cambie、L.N. Mander、A.K. Bose、M.S. Manhas
DOI:10.1016/s0040-4020(01)93227-2
日期:1964.1
The rotatory dispersion and circular dichroism spectra of several ketones conjugated with an aromatic ring (derived from diterpenoids and steroids) have been studied. These compounds show Cotton effect curves with peaks near 350mμ. Extremely weak UV absorption maxima in the 320- 350 mμ region can be detected for these ketones in iso-octane solution. This would indicate that the perturbing light wave
Podocarpic arid was converted to taxodione. Since the totalsynthesis of the former is recorded, this conversion implies a totalsynthesis of the latter.
干旱的罗汉松被转化为紫杉二酮。由于记录了前者的总合成,因此这种转换意味着后者的总合成。
The Structure and Configuration of Resin Acids. Podocarpic Acid and Ferruginol