Abstract
The first synthesis of 1,4-diazepine 2,5-dione peptides containing a β-amino acid in which the β carbon is also the anomeric carbon of a furanoid sugar is described. These new anomeric spirosugars obtained with a stereoselective control in the d- gulo, d- manno, d- allo and d- ribo series can be regarded as the first members of a new class of spironucleosides. In the course of our study, two symmetrical tetrameric cyclopeptides comprising two identical sugar β-amino acid and α-amino acid residues were also isolated, these structures could be of interest as new potential host molecules.
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