A novel visible-light-induced aza-pinacol rearrangement was developed for the first time. In this approach, the addition of the N-centered radical to the C═C bond of alkylidenecyclopropanes delivers a variety of cyclobutanimines and γ-butyrolactones, with all-carbon quaternary centers via the ringexpansion of the cyclopropyl group, in moderate to good yields under mild reaction conditions.
Here we describe a metal-free amino-heteroarylation of unactivatedolefins via organic photoredox catalysis, providing a concise and efficient approach for the rapid synthesis of various δ (β, ε)-amino ketones under mild conditions. This protocol demonstrates that the new photocatalyst Cz-NI developed by our group has an excellent photoredox catalytic performance. Finally, a series of mechanistic experiments
2-aminooxygenation reaction of 1,3-dienes by dual photoredox and coppercatalysis is described. This protocol uses N-aminopyridinium salts as N-centered radical precursors and nucleophilic alcohols as oxygen sources, providing modular and practical access to 1,2-aminoalkoxylation products with good yields and regioselectivity. Preliminary mechanistic studies support the radical property of the reaction and the
描述了通过双重光氧化还原和铜催化的 1,3-二烯的三组分 1,2-氨基氧化反应。该协议使用N-氨基吡啶盐作为以 N 为中心的自由基前体和亲核醇作为氧源,提供模块化和实用的 1,2-氨基烷氧基化产品,具有良好的产率和区域选择性。初步的机理研究支持反应的自由基性质和以 N 为中心的自由基中间体的参与。
Photoredox-Catalyzed Tandem Cyclization of Enaminones with <i>N</i>-Sulfonylaminopyridinium Salts toward the Synthesis of 3-Sulfonaminated Chromones
A photoredox-catalyzed intermolecular tandem sulfonamination/cyclization of enaminones was realized by using N-aminopyridinium salts as the sulfonaminated reagents without transition-metal catalysts or bases. The reaction exhibits a broad scope and good functional group tolerance, good yields, and regioselectivity. Preliminary mechanistic studies support the radical property of the reaction and the
Cobalt-Promoted Photoredox 1,2-Amidoamination of Alkenes with <i>N</i>-Sulfonamidopyridin-1-ium Salts and Free Amines
作者:Liang-Feng Yang、Zhi-Qiang Xiong、Xuan-Hui Ouyang、Qiu-An Wang、Jin-Heng Li
DOI:10.1021/acs.orglett.4c00155
日期:2024.3.1
A cobalt-promoted photoredox 1,2-amidoamination of alkenes with N-sulfonamidopyridin-1-ium salts and freeamines for the synthesis of unsymmetrical vicinal diamines has been developed. The reaction handles N-(sulfonamido)pyridin-1-ium salts as the sulfonamidyl radical precursors and freeamines as the nucleophilic terminating reagents to enable the formation of two new C(sp3)–N bonds in a single reaction