作者:David J. Bentley、Alexandra M. Z. Slawin、Christopher J. Moody
DOI:10.1021/ol060153c
日期:2006.5.1
beta-carbon link, has been synthesized. The key steps include the formation of this amino acid through a thioxo-oxazolidine intermediate and a Horner-Wadsworth-Emmons reaction using a phosphonoglycine, derived by a dirhodium(II)-catalyzed N-H insertion reaction, to give a dehydroamino acid and subsequent rhodium(I)-catalyzed asymmetric hydrogenation to introduce the modified tryptophan residue.
[结构:见正文]已合成了天然存在的大环五肽单链烷酸的甲酯,该甲酯含有一个不寻常的β-取代的α-氨基酸,其色氨酸C-6与亮氨酸的β-碳键相连。关键步骤包括通过thioxo-oxazolidine中间体形成该氨基酸,以及使用膦酰甘氨酸的Horner-Wadsworth-Emmons反应,该膦酰基甘氨酸是由二ho(II)催化的NH插入反应衍生而来的,从而得到脱氢氨基酸和随后的铑( I)催化的不对称氢化以引入修饰的色氨酸残基。