Late-Stage Photoredox C–H Amidation of N-Unprotected Indole Derivatives: Access to <i>N</i>-(Indol-2-yl)amides
作者:Yue Weng、Bo Ding、Yunqing Liu、Chunlan Song、Lo-Ying Chan、Chien-Wei Chiang
DOI:10.1021/acs.orglett.1c00609
日期:2021.4.2
carboxamides are valuable in pharmaceutical applications, the preparation N-(indol-2-yl)amides with similar structures continues to be challenging. Herein we report on visible-light-induced late-stage photoredox C–H amidation with N-unprotected indoles and tryptophan-containing peptides, leading to the formation of N-(indol-2-yl)amide derivatives. N-Unprotected indoles and aryloxyamides that contain an electron-withdrawing
N-未保护的吲哚的后期功能化可用于修饰低分子量药物和生物活性肽。吲哚羧酰胺在医药应用中很有价值,而具有相似结构的N-(吲哚-2-基)酰胺的制备仍然具有挑战性。本文中我们报道了可见光诱导的后期光氧化还原C–H酰胺化与N-未保护的吲哚和含色氨酸的肽,导致N的形成-(吲哚-2-基)酰胺衍生物。通过在室温下用绿色发光二极管照射,可以将含有吸电子基团的N-未保护的吲哚和芳氧基酰胺直接偶联至曙红Y作为光催化剂。机理研究和密度泛函理论计算表明,这种转变可能通过吲哚从PS *到PS •–循环的C–H氧化功能化而进行。该协议为N-未保护的吲哚衍生物的后期修饰标记和肽-药物结合提供了一个新的工具包。