β-Alkenylation of Saturated <i>N</i>-Heterocycles via a C(sp<sup>3</sup>)–O Bond Wittig-like Olefination
作者:Ángel A. Nolasco-Hernández、Leticia Quintero、Silvano Cruz-Gregorio、Fernando Sartillo-Piscil
DOI:10.1021/acs.joc.3c02466
日期:2024.2.2
azepane into their corresponding 3-exo-alkenyl lactams via the transient formation of 3-alkoxyamino lactams followed by a Wittig-like C(sp3)–O bond olefination with stabilized ylides from phosphonium salts mediated by t-BuOK. Additionally, as a proof of the synthetic effectiveness of this novel methodology, the first synthesis of the natural product callylactam A was achieved through a TiCl4-catalyzed
虽然N-杂环的C-H α官能化实际上是一个容易的化学转化,但C-H β官能化相反是一个相当困难的化学过程。在这里,我们提出了一个两步方案,通过瞬时形成 3-烷氧基氨基内酰胺,然后形成类似 Wittig 的 C(sp 3 )–O 键与由t -BuOK 介导的鏻盐中的稳定叶立德进行烯化。此外,作为这种新方法的合成有效性的证明,天然产物callylactam A的首次合成是通过TiCl 4催化的3-外型-烯基2-哌啶酮双键异构化为其内型异构体实现的。