Enantioselective rhodium/ruthenium photoredox catalysis en route to chiral 1,2-aminoalcohols
作者:Jiajia Ma、Klaus Harms、Eric Meggers
DOI:10.1039/c6cc04397f
日期:——
A rhodium-based chiral Lewis acid catalyst combined with [Ru(bpy)3](PF6)2 as photoredox sensitizer allows for the visible-light-activated redox coupling of [small alpha]-silylamines with 2-acyl imidazoles to afford, after desilylation, 1,2-amino-alcohols in yields...
desilylative and decarboxylative additions, allylations, and heteroarylations in the presence of graphitic carbon nitride (g-C3N4) was developed. The procedure has broad scope and provides the desired products in high yields. The heterogeneous nature of the g-C3N4 catalytic system enables easy recovery and recycling as well as the use in multiple runs without loss of activity. The photoredox catalyzed reactions
已开发了在存在石墨化碳氮化物(gC 3 N 4)的情况下,进行甲硅烷基胺和α-氨基酸的光氧化活化的方案,以进行脱甲硅基和脱羧的加成,烯丙基化和杂芳基化。该方法具有广泛的范围,并以高收率提供了所需的产品。gC 3 N 4催化系统的非均质性质使其易于回收和循环利用,并且可以多次使用而不会损失活性。光氧化还原催化的反应也可以以连续的光流方式进行并按比例放大至克级。因此,稳定且容易获得的聚合物gC 3 N 4 提供了均相光敏剂的替代品,用于生成有价值的自由基中间体,用于合成和催化。
Visible Light Photocatalytic Radical–Radical Cross-Coupling Reactions of Amines and Carbonyls: A Route to 1,2-Amino Alcohols
An intermolecular radical–radical cross-coupling reaction of secondary and tertiary amines with aryl ketones and aldehydes has been developed using visiblelightphotoredoxcatalysis. This reaction provides an efficient and straightforward approach to some useful 1,2-amino alcohols in moderate to good yields under mild conditions.
Employing Visible-Light Photoredox Catalysis in Multicomponent–Multicatalyst Reactions: One-Pot Synthesis of Spiroquinazolin-2-(thi)ones
作者:Zhentao Pan、Xuancheng Yang、Bo Chen、Shuaijun Shi、Tong Liu、Xuqiong Xiao、Linlin Shen、Li Lou、Yongmin Ma
DOI:10.1021/acs.joc.1c03151
日期:2022.3.4
multicomponent–multicatalyst reaction ((MC)2R) and visible-lightcatalysis have emerged as green and powerful strategies for achieving ideal syntheses. Here, we report the first example of a visible-light-induced approach toward spiroquinazolin(thi)ones. This (MC)2R features an eco-friendly energy source and solvent, metal-free catalysts, step- and atom-economy, a relay catalysis strategy, air as green oxidant
多组分-多催化剂反应((MC) 2 R)和可见光催化已成为实现理想合成的绿色且强大的策略。在这里,我们报告了可见光诱导的螺喹唑啉(噻)酮方法的第一个例子。这种 (MC) 2 R 具有环保的能源和溶剂、无金属催化剂、步进和原子经济、中继催化策略、空气作为绿色氧化剂、温和的条件和易于获得的起始材料。
Visible-light photoredox-promoted desilylative allylation of α-silylamines: An efficient route to synthesis of homoallylic amines
作者:Lulu Fan、Fukun Cheng、Tingting Zhang、Guoxing Liu、Jinwei Yuan、Pu Mao
DOI:10.1016/j.tetlet.2021.153357
日期:2021.9
desilylative allylation of α-silylamines with allylic sulfones is described. A variety of α-silylamines derived from anilines, cyclic and acyclic alkyl amines reacted with a serious of mono or disubstituted allylic sulfones well to provide homollylic amines in good to highyields under very mild reaction conditions.