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
详细介绍了带有l-Asn3 / d-Asn-4或d-Asn3 / 1-Asn4立体化学的叶绿素融合蛋白环肽的两个非对映异构体的有效合成。制备了四个关键的亚基,依次偶联并环化以提供两个非对映大环。天冬酰胺残基3和4的绝对立体化学分别通过将两个非对映异构体的NMR数据与报道的天然产物的NMR数据相关联而定为l和d。[结构:见文字]