Expanding the Scope of the Acyl-Type Radical Addition Reactions Promoted by SmI<sub>2</sub>
作者:Jakob Karaffa、Karl B. Lindsay、Troels Skrydstrup
DOI:10.1021/jo061299s
日期:2006.10.1
N-Acyl oxazolidinones of simple carboxylic acids and amino acids were observed to undergo successful SmI2-promoted couplings with substituted acrylamides and acrylates, affording a variety of functionalized γ-ketoamides and -esters with yields attaining 85%. As many of these reductive couplings were previously found to be ineffective employing the corresponding 4-pyridylthio esters, the applicability
观察到简单羧酸和氨基酸的N-酰基恶唑烷酮与取代的丙烯酰胺和丙烯酸酯成功进行了SmI 2促进的偶联,提供了多种官能化的γ-酮酰胺和酯,收率达到85%。由于先前发现许多这些还原偶联在使用相应的4-吡啶基硫代酯方面是无效的,因此该方法的适用性已得到显着改善。该方法适用于制备与两种有效的天冬氨酸蛋白酶抑制剂,肾素抑制剂阿利吉仑和γ-分泌酶抑制剂L-685,458有关的结构。最后,用于制备一个方便的两步程序Ñ的酰基恶唑烷酮Ñ已经设计了-保护的氨基酸,其提供了始终良好的相应酰亚胺的产率。