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Streamlined syntheses of (-)-dictyostatin, 16-desmethyl-25,26- dihydrodictyostatin, and 6- epi -16-desmethyl-25,26-dihydrodictyostatin

Zhu, W and Jiménez, M and Jung, WH and Camarco, DP and Balachandran, R and Vogt, A and Day, BW and Curran, DP (2010) Streamlined syntheses of (-)-dictyostatin, 16-desmethyl-25,26- dihydrodictyostatin, and 6- epi -16-desmethyl-25,26-dihydrodictyostatin. Journal of the American Chemical Society, 132 (26). 9175 - 9187. ISSN 0002-7863

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The dictyostatins are a promising class of potential anti-cancer drugs because they are powerful microtubule-stabilizing agents, but the complexity of their chemical structures is a severe impediment to their further development. On the basis of both synthetic and medicinal chemistry analyses, 16-desmethyl-25,26-dihydrodictyostatin and its C6 epimer were chosen as potentially potent yet accessible dictyostatin analogues, and three new syntheses were developed. A relatively classical synthesis involving vinyllithium addition and macrocyclization gave way to a newer and more practical approach based on esterification and ring-closing metathesis reaction. Finally, aspects of these two approaches were combined to provide a third new synthesis based on esterification and Nozaki-Hiyama-Kishi reaction. This was used to prepare the target dihydro analogues and the natural product. All of the syntheses are streamlined because of their high convergency. The work provided several new analogues of dictyostatin, including a truncated macrolactone and a C10 E-alkene, which were 400- and 50-fold less active than (-)-dictyostatin, respectively. In contrast, the targeted 16-desmethyl-25,26-dihydrodictyostatin analogues retained almost complete activity in preliminary biological assays. © 2010 American Chemical Society.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Zhu, W
Jiménez, M
Jung, WH
Camarco, DP
Balachandran, R
Vogt, A
Day, BW
Curran, DPcurran@pitt.eduCURRAN
Date: 7 July 2010
Date Type: Publication
Journal or Publication Title: Journal of the American Chemical Society
Volume: 132
Number: 26
Page Range: 9175 - 9187
DOI or Unique Handle: 10.1021/ja103537u
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Refereed: Yes
ISSN: 0002-7863
MeSH Headings: Carbon--chemistry; Cell Line, Tumor; Cell Proliferation--drug effects; Esterification; Humans; Lactones--chemistry; Lithium--chemistry; Macrolides--chemical synthesis; Macrolides--chemistry; Macrolides--pharmacology
Other ID: NLM NIHMS214066, NLM PMC2903049
PubMed Central ID: PMC2903049
PubMed ID: 20545347
Date Deposited: 08 Feb 2013 20:46
Last Modified: 04 Feb 2019 15:57


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