C–H Functionalization of <i>N</i>-Methylated Amino Acids and Peptides as Tool in Natural Product Synthesis: Synthesis of Abyssenine A and Mucronine E
作者:Thorsten Kinsinger、Uli Kazmaier
DOI:10.1021/acs.orglett.8b03475
日期:2018.12.7
N-Methylated amino acids and peptides with an 8-aminoquinoline (AQ) directing group can be subjected to stereoselective Pd-catalyzed β-functionalizations. The best results are obtained with aryl iodides, but alkyl and alkenyl side chains can also be introduced. The AQ protecting group can easily be removed, providing the free carboxylic acid, which can be used directly in peptide couplings. This protocol
N-甲基化的氨基酸和带有8-氨基喹啉(AQ)导向基团的肽可以进行立体选择性Pd催化的β-官能化。使用芳基碘化物可获得最佳结果,但是也可以引入烷基和烯基侧链。可以轻松除去AQ保护基,提供游离羧酸,可以将其直接用于肽偶联。该方案已成功用作合成环肽生物碱Asssenine A和mucronine E的关键步骤。