Saiyacenols A and B: the key to solve the controversy about the configuration of aplysiols
作者:Francisco Cen-Pacheco、Faustino Mollinedo、Janny A. Villa-Pulgarín、Manuel Norte、José J. Fernández、Antonio Hernández Daranas
DOI:10.1016/j.tet.2012.07.005
日期:2012.9
Two new cytotoxic oxasqualenoids, saiyacenols A and B, were isolated from the red alga Laurencia viridis and their structures elucidated by spectroscopic methods and chemical correlation with the well-known compound dehydrothyrsiferol. The new compounds share an important part of their structure with thyrsiferol and aplysiols B and C. Isolation of the saiyacenols concludes the controversy about the configuration of aplysiols, correcting the structure of aplysiol B. Our results illustrate the current limitations of NMR J-based methods when approaching quaternary carbons and demand a reappraisal of rational biogenetic proposals in structural elucidation. (C) 2012 Elsevier Ltd. All rights reserved.