Gold(I)-Catalyzed Cyclization–3-Aza-Cope–Mannich Cascade and Its Application to the Synthesis of Cephalotaxine
作者:Takeo Sakai、Chise Okumura、Masatoshi Futamura、Naotaka Noda、Akari Nagae、Chiharu Kitamoto、Madoka Kamiya、Yuji Mori
DOI:10.1021/acs.orglett.1c01323
日期:2021.6.4
The discovery of a new gold(I)-catalyzed cascade reaction involving cyclization onto a vinylammonium, 3-aza-Cope rearrangement, and Mannich cyclization is reported. A variety of fused nitrogen heterocycles were prepared from simple cyclic tertiary amines using 1–5 mol % of a AuCl(PPh3)/Ag[C5(CN)5] cocatalyst system. The developed reaction was used in a study aimed at synthesizing cephalotaxine. A five-step
据报道,发现了一种新的金 (I) 催化级联反应,包括环化到乙烯基铵、3-氮杂-科普重排和曼尼希环化。使用 1–5 mol% 的 AuCl(PPh 3 )/Ag[C 5 (CN) 5 ] 助催化剂体系,从简单的环状叔胺制备了多种稠氮杂环。开发的反应用于旨在合成头孢噻肟的研究中。来自去甲肼苯哒嗪的五步操作以 39.1% 的总收率提供了去甲基头孢噻吩,其分两步转化为 (-)-头孢噻肟。