作者:Oyejobi, Aanuoluwapo O.、Huang, Jie、Luo, Yun-Xuan、Tang, Xiang-Ying、Wang, Long
DOI:10.1021/acs.joc.4c00833
日期:——
The incorporation of oxygen atoms from air under aerobic conditions plays an important role in organic synthesis. Herein, Brønsted acids are found to be a two-in-one strategic catalyst to transform enamines from β-oxoamides and amines to pyrrolin-4-ones without an external photocatalyst under visible-light conditions. The Brønsted acid can inhibit the C–C bond fragmentation of the [2 + 2] adduct from
在有氧条件下从空气中引入氧原子在有机合成中起着重要作用。在此,布朗斯台德酸被发现是一种二合一的战略催化剂,在可见光条件下无需外部光催化剂即可将烯胺从β-氧代酰胺和胺转化为吡咯啉-4-酮。布朗斯台德酸可以抑制烯胺和1 O 2生成的[2 + 2]加合物的 C-C 键断裂,但最重要的是,它可以通过酸变色作用与烯胺和吡咯啉-4-酮产物形成光敏剂,促进1 O 2代。
Cu(TFA)<sub>2</sub>-Catalyzed Oxidative Tandem Cyclization/1,2-Alkyl Migration of Enamino Amides for Synthesis of Pyrrolin-4-ones
A novel Cu(TFA)(2)-catalyzed oxidative tandem cyclization/1,2-alkyl migration of readily available enamino amides for the synthesis of pyrrolin-4-ones has been developed. The reaction tolerates a wide range of functional groups and is a reliable method for the rapid synthesis of substituted pyrrolin-4-ones in high yields under mild conditions.
Efficient Synthesis of Highly Substituted Pyrrolin-4-ones via PIFA-Mediated Cyclization Reactions of Enaminones
highly substituted pyrrolin-4-ones is developed via the PIFA-mediated cyclization reactions of readily available enaminones, and a mechanism involving sequential cleavage of N-C bond, formation of new N-C bond, intramolecular addition reaction, and benzilicacid type rearrangement is proposed.