Enantioselective synthesis of an unnatural bipyridyl amino acid and its incorporation into a peptide
作者:Kenneth J. Kise、Bruce E. Bowler
DOI:10.1016/s0957-4166(98)00350-4
日期:1998.9
The synthesis of a bipyridyl amino acid, 2-amino-3-(4′-methyl-2,2′-bipyridin-4-yl) propanoic acid, is described. A short three step synthesis from commercially available 4,4′-dimethyl-2,2′-bipyridine provides the amino acid in 65% enantiomeric excess (ee). An enzyme-mediated chiral resolution increases the ee to 95% in two additional steps. The amino acid was incorporated into a 22 amino acid peptide
描述了联吡啶基氨基酸2-氨基-3-(4'-甲基-2,2'-联吡啶-4-基)丙酸的合成。由市售的4,4'-二甲基-2,2'-联吡啶进行的短短的三步合成提供了65%对映体过量(ee)的氨基酸。酶介导的手性拆分在另外两个步骤中将ee提高到95%。将该氨基酸掺入主要由丙氨酸组成的22个氨基酸的肽中。通过圆二色性(CD)光谱极化法,发现该肽在1℃的水溶液中为88%α-螺旋,表明该氨基酸的高螺旋倾向。该氨基酸可提供将金属掺入形成结构的肽中的手段。