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。
The coupling reaction of α-silylamines with Baylis-Hillman adducts by visible light photoredox catalysis
The preparation of N-containing α,β-unsaturated carboxylate derivatives from α-silylamine and Baylis-Hillmanadducts under visible light irradiation was reported. The formation of α-aminoalkyl radical is regioselective compared with the previous reports. The reaction was successfully performed without additional additives 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.
A single-electron transfer (SET) between tris(pentafluorophenyl)borane (B(C6F5)3) and N,N-dialkylanilines is reported, which is operative via the formation of an electron donor–acceptor (EDA) complex involving π-orbital interactions as a key intermediate under dark conditions or visible-light irradiation depending on the structure of the aniline derivatives. This inherent SET in the Lewis pairs initiates
据报道,三(五氟苯基)硼烷(B(C 6 F 5)3)与N,N-二烷基苯胺之间发生单电子转移(SET),该过程通过形成电子供体-受体(EDA)络合物而起作用。取决于苯胺衍生物的结构,在黑暗条件或可见光照射下,π轨道相互作用是关键的中间产物。Lewis对中的这种固有SET引发了相应α-氨基烷基自由基的生成及其向缺电子烯烃中的加成,从而揭示了B(C 6 F 5)3充当有效的单电子氧化还原催化剂的能力。