73956-17-9Relevant articles and documents
Structure elucidation of colibactin and its DNA cross-links
Xue, Mengzhao,Kim, Chung Sub,Healy, Alan R.,Wernke, Kevin M.,Wang, Zhixun,Frischling, Madeline C.,Shine, Emilee E.,Wang, Weiwei,Herzon, Seth B.,Crawford, Jason M.
, (2019/09/16)
Colibactin is a complex secondary metabolite produced by some genotoxic gut Escherichia coli strains. The presence of colibactin-producing bacteria correlates with the frequency and severity of colorectal cancer in humans. However, because colibactin has not been isolated or structurally characterized, studying the physiological effects of colibactin-producing bacteria in the human gut has been difficult. We used a combination of genetics, isotope labeling, tandem mass spectrometry, and chemical synthesis to deduce the structure of colibactin. Our structural assignment accounts for all known biosynthetic and cell biology data and suggests roles for the final unaccounted enzymes in the colibactin gene cluster.
Asymmetric aldol reaction of thiazole-carbaldehydes: Regio- And stereoselective synthesis of tubuvalin analogues
Paladhi, Sushovan,Das, Joydeb,Samanta, Mousumi,Dash, Jyotirmayee
supporting information, p. 3370 - 3376 (2015/02/02)
The first organocatalytic enantioselective approach to precursors of tubuvaline (pre-Tuv) is presented employing a prolinamide-catalyzed aldol reaction of easily accessible thiazole-carbaldehyde with methyl isopropyl ketone "on water" in excellent yield as well as regio- and enantioselectivities. The analogues of pre-Tuv were achieved using an l-proline-catalyzed direct asymmetric aldol reaction of substituted thiazole-carbaldehydes with acetone. A direct and flexible approach to the tubavaline (Tuv) core of tubusylins has been established employing the reductive amination of the pre-Tuv species. The key aldol reaction should greatly expand the potential of this strategy to the synthesis of natural product tubulysins and a range of analogues.
An improved synthesis of pyridine-thiazole cores of thiopeptide antibiotics
Aulakh, Virender S.,Ciufolini, Marco A.
supporting information; experimental part, p. 5750 - 5753 (2009/12/06)
(Figure Presented) The oxidation of 2-methylthiazoles to 2-formylthiazoles simplifies the implementation of the Bagley variant of the Bohlmann-Rahtz reaction as a key step in a concise new route to pyridine cores of thiopeptide antibiotics.