2002
DOI: 10.1016/s0960-894x(02)00305-0
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Synthesis and biological evaluation of a spongistatin AB-spiroketal analogue

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Cited by 28 publications
(23 citation statements)
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“…In summary, we have shown that, in contrast to SPIKET-P [24], several similar spiroacetals display cytotoxicity, show interactions with tubulin and have a measurable effect on the assembly of microtubules. However, the precise mechanism of action and the possible binding sites of these spiroacetals still remain to be established.…”
Section: Discussionmentioning
confidence: 81%
See 1 more Smart Citation
“…In summary, we have shown that, in contrast to SPIKET-P [24], several similar spiroacetals display cytotoxicity, show interactions with tubulin and have a measurable effect on the assembly of microtubules. However, the precise mechanism of action and the possible binding sites of these spiroacetals still remain to be established.…”
Section: Discussionmentioning
confidence: 81%
“…This group found that neither SPIKET-P nor a closely related analog showed a measurable activity against several human cancer cell lines. Furthermore, they neither inhibited polymerization of tubulin nor caused polymer disassembly using several assays [24].…”
Section: Introductionmentioning
confidence: 92%
“…Interessanterweise zeigen strukturell vereinfachte Derivate, die aber noch die charakteristische SpiroketalGruppierung aufweisen, oft eine vergleichbare biologische Aktivität wie die natürliche Stammverbindung. [59] In einer asymmetrischen Festphasensynthese von Spiro-[5.5]ketalen [60] wurde ausgehend vom immobilisierten Aldehyd 118 (Schema 15) durch Aldolreaktion mit dem vorab gebildeten Z-Borenolat A das enantiomerenangereicherte Aldoladdukt 119 erhalten. Im Unterschied zur Lösungsre-aktion waren zwei Zyklen mit sechs ¾quivalenten des chiralen Reagens A nötig, um den Aldehyd vollständig umzusetzen.…”
Section: Verbindungsbibliotheken Mit Einem Spiroacetal Als Strukturmotivunclassified
“…For spongistatin 1 and cinachyrolide A, the stereostructure was only partially determined. At that time, the differences mainly concerned the relative configurations of AB, CD spiroketals and E-ring, as well as the stereochemistry at C (14), C (15) and C(47). Further considerable efforts led to the isolation of spongistatins 2e9 [8].…”
Section: Isolation Structures and Biological Activitiesmentioning
confidence: 99%
“…According to their studies, spiroketal-diol 1 induced apoptosis in human breast cancer cells at the 10 nM level, caused tubulin depolymerisation at the 500 nM level and affected GTP-induced assembly of bovine brain microtubule protein [13]. Prompted by these remarkable biological results on such a structurally simple surrogate of spongistatins, Smith proposed the synthesis of an analogue of spongistatins AB spiroketal (2) that was also submitted to biological evaluation [14]. Neither derivative 2 nor the parent compound 1 displayed significant activity against several human cancer cell lines.…”
Section: Isolation Structures and Biological Activitiesmentioning
confidence: 99%