4163-40-0Relevant articles and documents
A Substituent-Directed Strategy for the Selective Synthesis of L-Hexoses: An Expeditious Route to L-Idose
See, Nicholas W.,Wimmer, Norbert,Krenske, Elizabeth H.,Ferro, Vito
, p. 1575 - 1584 (2021/03/03)
L-Hexoses are rare but biologically significant components of various important biomolecules. However, most are prohibitively expensive (if commercially available) which limits their study and biotechnological exploitation. New, efficient methods to access L-hexoses and their derivatives are thus of great interest. In a previous study, we showcased a stereoselective Bu3SnH-mediated transformation of a 5-C-bromo-D-glucuronide to an L-iduronide. We have now drawn inspiration from this result to derive a new methodology – one that can be harnessed to access other L-hexoses. DFT calculations demonstrate that a combination of a β-F at the anomeric position and a methoxycarbonyl substituent at C-6 is key to optimising the selectivity for the L-hexose product. Our investigations have also culminated in the development of the shortest known synthetic route to a derivative of L-idose from a commercially available starting material (45 % yield over 3 steps). Collectively, these results address the profound lack of understanding of how to synthesise L-hexoses in a stereoselective fashion.
Synthesis of glycosyl fluorides from thio-, seleno-, and telluroglycosides and glycosyl sulfoxides using aminodifluorosulfinium tetrafluoroborates
Tsegay, Sammi,Williams, Rohan J.,Williams, Spencer J.
experimental part, p. 16 - 22 (2012/09/21)
Glycosyl fluorides can be synthesized from thio-, seleno-, and telluroglycosides and glycosyl sulfoxides using the aminodifluorosulfinium tetrafluoroborate reagents Xtalfluor-E and -M, with or without added N-bromosuccinimide. Mechanistic studies provide evidence that fluoride is delivered from the tetrafluoroborate counterion.
Reaction of 1,2-orthoesters with HF-pyridine: A method for the preparation of partly unprotected glycosyl fluorides and their use in saccharide synthesis
Cristobal Lopez,Ventura, Juan,Uriel, Clara,Gomez, Ana M.,Fraser-Reld, Bert
supporting information; experimental part, p. 4128 - 4131 (2009/12/30)
Glycosyl fluorides can be prepared In an efficient manner by treatment of pyranose- or furanose-derlved 1,2-orthoesters, with hydrogen fluoride pyridine (HF-py). The method Is compatible with the presence of a variety of protecting groups, including fert-