Aspyrone (1) was elaborated in an optically pure form by a key reaction involving the highly diastereoselective addition of tetrahydropyranone enol ate to 2-tosyloxy-aldehyde and the subsequent in situ formation of an epoxide.
The macrocyclic antibiotic mangrolide A has been described to exhibit potent activity against a number of clinically important Gram‐negative pathogens. Reported is the first enantioselective totalsynthesis of mangrolide A and derivatives. Salient features of this synthesis include a highly convergent macrocycle preparation, stereoselective synthesis of the disaccharide moiety, and two β‐selective
An Improved Approach to the Direct Construction of 2‐Deoxy‐β‐Linked Sugars: Applications to Oligosaccharide Synthesis
作者:Dina Lloyd、Clay S. Bennett
DOI:10.1002/chem.201800736
日期:2018.5.28
for the synthesis of 2,6‐dideoxy and 2,3,6‐trideoxy sugar donors in good yield and high β‐selectivity is reported. The use of p‐toluenesulfonyl chloride and potassium hexamethyldisilazide (KHMDS) greatly simplifies deoxy‐sugar glycoside construction, and can be used for gram‐scale glycosylation reactions. The development of this approach and its application to the construction of β‐linked deoxy‐sugar