Based on spectral and chemical evidence, ishwarone, the tetracyclic sesquiterpene ketone fromAristolochia indica, has been shown to have the structure 6.
To test the selectivity of sterically hindered systems, (+)-nootkatone and derivatives were subjected to a wide variety of hydrogenation methodologies. The steric impact of the C-4 methyl substituent seems to be responsible for the inability of the system to adopt the cis-fused structure.
作者:T. R. Govindachari、K. Nagarajan、P. C. Parthasarathy
DOI:10.1039/c2969000823a
日期:——
The absolutestereochemistry of ishwarone, the tetracyclic sesquiterpene ketone from Aristolochia indica, has been rigorously established as (I) by chemical correlation with (+)-nootkatane.