Stereochemistry of cyclolignans - a revised structure for thomasic acid
β Scribed by A.F.A. Wallis
- Publisher
- Elsevier Science
- Year
- 1968
- Tongue
- French
- Weight
- 96 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0040-4039
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π SIMILAR VOLUMES
Hermonionic acid and its decarboxylated product have been lsolatcd from Garcinia quaesita. 13 C IWR spectral and chemical evidence indicate that hem?rionic acid is 2-O-E-(3 -methylbut-2-enyl)-3-methoxy-4-hydroxy-5-(3,7-dlmethyl.octa-?,6-dieny~ -4-methoxy-5-(3-methylbut-2-enyl -G-hydroxybenzolc acid.
Clavicipitic acid was obtained by Robbers and Floss' from submerged cultures of Claviceps strain SD-58, to which ill-ethionine had been added to inhibit F-methylation in clavine alkaloid biosynthesis. Cn mass spectral, n.m.r., and biosynthetic evidence they proposed the structure (I). ## Me We h
## Abstract For Abstract see ChemInform Abstract in Full Text.
## Abstract Polyalthic acid, a new diterpene acid isolated from __Polyalthia fragrans__ (BTH.) has been shown, by degradation and correlation with neoabietic acid, to have the structure and stereochemistry depicted in formula I.
The structure of hippospongic acid A was reinvestigated and new evidence supporting the revised structure previously proposed was obtained. The structure, including absolute configuration, was established by the enantioselective synthesis.