Stereocontrolled Total Synthesis of (−)-Callipeltoside A
作者:Ian Paterson、Robert D. M. Davies、Annekatrin C. Heimann、Rodolfo Marquez、Arndt Meyer
DOI:10.1021/ol0357853
日期:2003.11.1
text] A highly stereocontrolled total synthesis of the cytotoxic macrolide (-)-callipeltoside A has been achieved in 23 steps (4.8% overall). Notable features include a novel asymmetric vinylogous aldol reaction to install the C13 stereocenter and (E)-trisubstituted alkene, an anti-selective aldol addition, a Sonogashira coupling, and, last, a Schmidt-type glycosylation to attach the sugar unit.
Synthetic Studies on the <i>trans</i>-Chlorocyclopropane Dienyne Side Chain of Callipeltoside A
作者:Horacio F. Olivo、Francisco Velázquez、Henrique C. Trevisan
DOI:10.1021/ol006696i
日期:2000.12.1
[GRAPHICS]Enantiomerically enriched trans-chlorocyclopropanemethanol was obtained by lipase kinetic resolution of dichlorocyclopropanemethanol 3, followed by reduction. The sp-sp(2) bond of the trans-chlorocyclopropane dienyne side chain of callipeltoside A was constructed via a Stifle coupling reaction of 1,1-dibromo-1-alkene 7 and a vinylstannane in a highly dipolar solvent capable of promoting HBr elimination to give internal alkynes.