Dolabelides C and D, Cytotoxic Macrolides Isolated from the Sea Hare Dolabella auricularia
摘要:
Two new cytotoxic 24-membered macrolides, dolabelides C and D, were isolated from the Japanese sea hare Dolabella auricularia. Their gross structures were deduced by spectroscopic analysis including the 2D NMR technique, and their absolute stereochemistry was determined by means of chemical correlation with the known dolabelide A. Dolabelides C and D exhibited cytotoxicities against HeLa S-3 cells with IC50 values of 1.9 and 1.5 mu g/mL, respectively.
The first total synthesis of dolabelide D (or of any of the closely related dolabelides) has been achieved with a longest linear sequence of 17 steps. Key features of the synthesis include an application of the catalytic asymmetric silane alcoholysis, the tandem silylformylation-crotylsilylation, and a Brook-like 1,4-carbon to oxygen silyl migration.
作者:Peter K. Park、Steven J. O'Malley、Darby R. Schmidt、James L. Leighton
DOI:10.1021/ja058692k
日期:2006.3.1
The first total synthesis of dolabelide D (or of any of the closely related dolabelides) has been achieved with a longest linear sequence of 17 steps. Key features of the synthesis include an application of the catalytic asymmetric silane alcoholysis, the tandem silylformylation-crotylsilylation, and a Brook-like 1,4-carbon to oxygen silyl migration.
Dolabelides C and D, Cytotoxic Macrolides Isolated from the Sea Hare <i>Dolabella auricularia</i>
Two new cytotoxic 24-membered macrolides, dolabelides C and D, were isolated from the Japanese sea hare Dolabella auricularia. Their gross structures were deduced by spectroscopic analysis including the 2D NMR technique, and their absolute stereochemistry was determined by means of chemical correlation with the known dolabelide A. Dolabelides C and D exhibited cytotoxicities against HeLa S-3 cells with IC50 values of 1.9 and 1.5 mu g/mL, respectively.