Joined use of oxazolidinone and desymmetric amino protection: a new strategy for protection of glucosamine
摘要:
Joined use of N-benzyl oxazolidinone and N-benzyl-N-benzyloxycarbonyl (N-BnCbz) desymmetric amino-protecting function is reported. The new synthetic approach enables the facile preparation of type I and type 2 LacNAc disaccharides in satisfactory yields. One-pot deprotection of N-BnCbz and O-benzyl ether is achieved by hydrogenolysis under mild conditions. (C) 2010 Elsevier Ltd. All rights reserved.
Substituent effects in endocyclic cleavage–recyclization anomerization reaction of pyranosides
作者:Shino Manabe、Kazuyuki Ishii、Hiroko Satoh、Yukishige Ito
DOI:10.1016/j.tet.2011.09.059
日期:2011.12
Pyranosides with 2,3-trans carbamate or 2,3-trans carbonate groups are anomerized under mild acidic conditions via endocyclic cleavage reaction. In order to understand the nature of the anomerization reaction via the endocyclic cleavage recyclization process, the substituent effects at various positions were investigated. (C) 2011 Elsevier Ltd. All rights reserved.