Synthesis of the Chlorofusin Cyclic Peptide: Assignment of the Asparagine Stereochemistry
作者:Pankaj Desai、Steven S. Pfeiffer、Dale L. Boger
DOI:10.1021/ol036083g
日期:2003.12.1
An efficient synthesis of two diastereomers of the chlorofusin cyclic peptide bearing either the l-Asn3/d-Asn-4 or d-Asn3/l-Asn4 stereochemistry is detailed. Four key subunits were prepared, sequentially coupled, and cyclized to provide the two diastereomeric macrocycles. The absolute stereochemistry at the asparagine residues 3 and 4 was assigned as l and d, respectively, by correlating the NMR data