Synthesis of IB-01211, a Cyclic Peptide Containing 2,4-Concatenated Thia- and Oxazoles, via Hantzsch Macrocyclization
摘要:
An efficient and versatile convergent synthesis of IB-01211 based on a combination of peptide and heterocyclic chemistry is described. The key step in the synthesis is macrocyclization through intramolecular Hantzsch formation of the thiazole ring. Dehydration of a free primary alcohol to furnish the exocyclic methylidene present in the natural product was applied during the macrocyclization.
Total Synthesis of the Ribosomally Synthesized Linear Azole-Containing Peptide Plantazolicin A from<i>Bacillus amyloliquefaciens</i>
作者:Srinivas Banala、Paul Ensle、Roderich D. Süssmuth
DOI:10.1002/anie.201302266
日期:2013.9.2
cyclodehydration reaction has been used to synthesize the linear azole‐containing peptideplantazolicin A. The target compound was synthesized from two heterocyclic fragments derived from dipeptide building blocks. The acid‐labile oxazolines and thiazoles necessitate the use of a Teoc/TMSE‐based protection‐group strategy, which allows structure modification of plantazolicin.
Several analogues of the cytotoxic thiopeptide IB-01211 or mechercharmycin A (1) have been synthesized. The cytotoxicity of 1 and the synthesized analogues were evaluated against a panel of three human tumor cell lines. Thiopeptide 1 and the most active derivatives 2 and 3c were chosen for further studies on effects on cell cycle progression and induction of apoptosis. Interestingly, the inhibition of cell division and activation of a programmed cell death by apoptosis were detected.
Synthesis of IB-01211, a Cyclic Peptide Containing 2,4-Concatenated Thia- and Oxazoles, via Hantzsch Macrocyclization
作者:Delia Hernández、Gemma Vilar、Estela Riego、Librada M. Cañedo、Carmen Cuevas、Fernando Albericio、Mercedes Álvarez
DOI:10.1021/ol063023c
日期:2007.3.1
An efficient and versatile convergent synthesis of IB-01211 based on a combination of peptide and heterocyclic chemistry is described. The key step in the synthesis is macrocyclization through intramolecular Hantzsch formation of the thiazole ring. Dehydration of a free primary alcohol to furnish the exocyclic methylidene present in the natural product was applied during the macrocyclization.
Interception of the Bycroft–Gowland Intermediate in the Enzymatic Macrocyclization of Thiopeptides
作者:Jonathan W. Bogart、Nicholas J. Kramer、Aneta Turlik、Rachel M. Bleich、Daniel S. Catlin、Frank C. Schroeder、Satish K. Nair、R. Thomas Williamson、K. N. Houk、Albert A. Bowers
DOI:10.1021/jacs.0c05639
日期:2020.7.29
Thiopeptides are a broad class of macrocyclic, heavily modified peptide natural products that are unified by the presence of a substituted, nitrogen-containing heterocycle core. Early work indicated that this core might be fashioned from two dehydroalanines by an enzyme-catalyzed aza-[4+2] cycloaddition to give a cyclic-hemiaminal intermediate. This common intermediate could then follow a reductive