Synthesis of ω-Oxo Amino Acids and <i>trans</i>-5-Substituted Proline Derivatives Using Cross-Metathesis of Unsaturated Amino Acids
作者:Nabaz Salih、Harry Adams、Richard F. W. Jackson
DOI:10.1021/acs.joc.6b01571
日期:2016.9.16
A range of 7-oxo, 8-oxo, and 9-oxo amino acids, analogues of 8-oxo-2-aminodecanoic acid, one of the key components of the cyclic tetrapeptide apicidin, have been prepared by a three-step process involving copper-catalyzed allylation of serine-, aspartic acid-, and glutamic acid-derived organozinc reagents, followed by cross-metathesis of the resulting terminal alkenes with unsaturated ketones and hydrogenation
已通过三步法制备了一系列7-氧,8-氧和9-氧氨基酸,即环四肽阿匹西丁的关键成分之一,即8-氧-2-氨基癸酸的类似物。铜催化的丝氨酸,天冬氨酸和谷氨酸衍生的有机锌试剂的烯丙基化,然后将所得末端烯烃与不饱和酮交叉复分解和氢化。中间体7-氧代-5-烯酮进行高度非对映选择性(dr≥96:4)的酸催化aza-Michael反应,得到反式-2,5-二取代的吡咯烷,5-取代的脯氨酸衍生物。当将起始的烯酮在氘代氯仿中的溶液中静置时,首先观察到aza-Michael反应,但可以通过催化量的干燥HCl有效地促进该反应。