The first enantiospecific total synthesis of gualamycin has been accomplished by coupling the thioglycoside of the amino-disaccharide portion with the strained di-O-benzylidene derivative of the pyrrolidine-aglycone.
Total synthesis of the bacillosamine containing α-l-serine linked trisaccharide of Neisseria meningitidis
作者:Madhu Emmadi、Suvarn S. Kulkarni
DOI:10.1016/j.carres.2014.04.011
日期:2014.11
Total synthesis of the bacillosamine containing L-serine linked O-trisaccharide of Neisseria meningitidis is described. The synthesis entails installation of two consecutive alpha-linkages including the coupling of bacillosamine with L-serine derivative. (C) 2014 Elsevier Ltd. All rights reserved.
Glycosylations Directed by the Armed-Disarmed Effect with Acceptors Containing a Single Ester Group
作者:Thomas H. Schmidt、Robert Madsen
DOI:10.1002/ejoc.200700347
日期:2007.8
A selective glycosylation reaction controlled by the armed-disarmedeffect is described by the use of phenyl thioglycosides. The donor thioglycoside is fully protected with benzyl ethers while the acceptor thioglycoside contains benzyl ethers at position 2 and 3 and a strongly electron-withdrawing pentafluorobenzoate estergroup at position 6. The coupling can be performed with galactose, glucose,