Synthesis of the Unnatural Amino Acid AGDHE, a Constituent of the Cyclic Depsipeptides Callipeltins A and D
作者:Jason C. Thoen、Ángel I. Morales-Ramos、Mark A. Lipton
DOI:10.1021/ol0269852
日期:2002.12.1
[reaction: see text] The novel amino acid residue (2R,3R,4S)-4-amido-7-guanidino-2,3-dihydroxyheptanoic acid (AGDHE, 3), a constituent of the cyclic depsipeptides callipeltins A and D, and its (2S,3S,4S) diastereomer were synthesized from a protected L-ornithine derivative in 13 steps (15% overall yield), and its configurational assignment was reexamined by (1)H NMR.
[反应:请参阅文字]新的氨基酸残基(2R,3R,4S)-4-氨基-7-胍基-2,3-二羟基庚酸(AGDHE,3),是环状大肽肽callipeltins A和D的组成部分,由保护的L-鸟氨酸衍生物以13个步骤(总收率15%)合成其(2S,3S,4S)非对映异构体,并通过(1)H NMR重新检查其构型分配。