通过金与芳氧基乙炔和芳基炔丙基醚的蒽环金环氧化反应,可直接获得苯并呋喃[2,3- b ]喹啉和6 H -chromeno [3,4- b ]喹啉核
摘要:
这项工作报告了蒽与芳氧基乙炔或芳基炔丙基醚的轻松环合,分别构建有用的苯并呋喃[2,3- b ]喹啉和6 H- chromeno [3,4- b ]喹啉骨架。尽管这些杂环具有生物学意义,但仍不易从文献方法中获得。广泛的基材范围突出了这种高原子经济和阶梯经济的策略。提出通过α-亚氨基金卡宾中间体的氧芳基,金卡宾和苯甲醛之间的顺序环化来进行反应机理。
Catalytic Transformations of Alkynes into either α-Alkoxy or α-Aryl Enolates: Mannich Reactions by Cooperative Catalysis and Evidence for Nucleophile-Directed Chemoselectivity
作者:Rajkumar Lalji Sahani、Manoj D. Patil、Sachin Bhausaheb Wagh、Rai-Shung Liu
DOI:10.1002/anie.201806883
日期:2018.11.5
The catalytic formation of gold enolatesfrom alkynes, nitrones, and nucleophiles is described, and their Mannich reactions result in nucleophile‐directed chemoselectivity through cooperative catalysis. For 1‐alkyn‐4‐ols and 2‐ethynylphenols, their gold‐catalyzed nitrone oxidations afforded N‐containing dihydrofuran‐3(2H)‐ones with syn selectivity. The mechanism involves the Mannich reactions of gold