256341-86-3Relevant academic research and scientific papers
Total synthesis of everninomicin 13,384-1 - Part 4: Explorations of methodology; stereocontrolled synthesis of 1,1'-disaccharides, 1,2-seleno migrations in carbohydrates, and solution- and solid-phase synthesis of 2-deoxy glycosides and orthoesters
Nicolaou,Fylaktakidou, Konstantina C.,Mitchell, Helen J.,Van Delft, Floris L.,Rodriguez, Rosa Maria,Conley, Scott R.,Jin, Zhendong
, p. 3166 - 3185 (2007/10/03)
Methods for the stereocontrolled construction of 1,1'-disaccharides, 2-deoxy glycosides, and orthoesters are reported. Specifically, a tin-acetal moiety was utilized to fix the anomeric stereochemistry of a carbohydrate acceptor leading to an efficient and stereoselective synthesis of 1,1'-disaccharides, while a newly discovered 1,2-phenylseleno migration reaction in carbohydrates opened entries to 2-deoxy glycosides and orthoesters. Thus, reaction of 2-hydroxy phenylselenoglycosides with DAST led to 2-phenylselenoglycosyl fluorides which reacted with carbohydrate acceptors to afford, stereoselectively, 2-phenylselenoglycosides. The latter compounds could be reductively deselenated to 2-deoxy glycosides or oxidatively converted to orthoesters via the corresponding ketene acetals.
Total synthesis of everninomicin 13,384-1 - Part 2: Synthesis of the FGHA2 fragment
Nicolaou,Mitchell, Helen J.,Fylaktakidou, Konstantina C.,Rodriguez, Rosa Maria,Suzuki, Hideo
, p. 3116 - 3148 (2007/10/03)
The stereoselective synthesis of everninomicin's 13,384-1 (1) FGHA2 fragment (2) in a suitable form for incorporation into the final target (1) is described. The construction of the FG 1,1′-disaccharide linkage relied on a new method based on tin-acetal chemistry, while for the GH orthoester bridge, a number of approaches were explored. Final success for the latter construction came when a novel 1,2-phenylseleno migration reaction was applied to couple rings G and H, followed by ketene acetal and orthoester formation.
