A convergent total synthesis of the Annonaceous acetogenin squamostolide, in a longest linear sequence of nine steps from D-mannitol, is reported. Central to the efficiency of the synthesis is a highly selective tandem ring-closing/cross metathesis step in which lactone formation and fragment coupling are accomplished. (c) 2007 Elsevier Ltd. All rights reserved.
A convergent stereoselective synthesis of (4R,15R,16R,21S)- and (4R,15S,16S,21S)-rollicosin and squamostolide was accomplished via a Pd-catalyzed cross-coupling reaction. The inhibitory activity of these compounds was examined with bovine heart mitochondrial NADH-ubiquinone oxidoreductase. These compounds showed a remarkably weak inhibitory activity compared to ordinary acetogenins such as bullatacin
Squamostolide and its related analogs were designed and synthesized for biological evaluation. All these compounds were tested for growth inhibition activities against human tumor cell lines, in which one of the compounds showed the most potent cyto-toxicity among these derivatives against a full panel of 60 human cancer cell lines. The same compound also showed G2/M phase arrest and a weak apoptotic effect during flow cytometric analysis. (c) 2005 Elsevier Ltd. All rights reserved.