开发了一种区域选择性可见光介导的 1,2,3-苯并三嗪-4(3 H )-酮的脱氮烯烃插入,以获取 3-取代异吲哚啉酮,这是许多生物活性分子和天然产物中存在的重要结构基序。值得注意的是,通过从报道的镍催化(其中形成 C3 取代的 3,4-二氢异喹啉-1(2 H )-酮)转向光催化,实现了不同的反应性,其中光催化脱氮和随后的氮介导的氢原子转移导致排他性3-取代异吲哚啉酮形成。所开发的光催化反应与活化的末端烯烃和环状α,β-不饱和酯和酮相容,对1,2,3-苯并三嗪-4(3 H )-酮的N-取代具有广泛的官能团耐受性。该过程的实用性通过克级合成和合成后酰胺化得以凸显。为了了解这种独特的产物选择性的起源,进行了实验和计算机制研究。
Nickel-Catalyzed Denitrogenative Annulation of 1,2,3-Benzotriazin-4-(3<i>H</i>
)-ones with Benzynes for Construction of Phenanthridinone Scaffolds
作者:Vijaykumar H. Thorat、Nitinkumar Satyadev Upadhyay、Masahiro Murakami、Chien-Hong Cheng
DOI:10.1002/adsc.201701143
日期:2018.1.17
The synthesis of phenanthridinones via denitrogenative annulation of 1,2,3‐benzotriazin‐4‐(3H)‐ones with arynes catalysed by Ni(0)/dppm was successfully developed. A variety of phenanthridinones were prepared in good to excellent yields. Based on this method, nature product, N‐methylcrinasidine, was synthesized.
Nickel-Catalyzed, Manganese-Assisted Denitrogenative Cross-Electrophile-Coupling of Benzotriazinones with Alkyl Halides for ortho-Alkylated Benzamides
作者:Fengze Wang、Yi Tong、Gang Zou
DOI:10.1021/acs.orglett.2c02182
日期:2022.8.12
Br, I) in the presence of manganese powder as a reductant has been developed. The reaction furnishes ortho-alkylated secondary benzamides in modest to good yields under mild conditions. The scope of the reaction is demonstrated with 25 examples, showing good tolerance of steric hindrance and common functional groups, thus providing an efficient protocol to ortho-alkylated benzamide derivatives without
Mechanoredox/Nickel Co-Catalyzed Cross Electrophile Coupling of Benzotriazinones with Alkyl (Pseudo)halides
作者:Huimin Wang、Wenbin Ding、Gang Zou
DOI:10.1021/acs.joc.3c00681
日期:2023.9.15
cocatalysis of strontium titanate remarkably improves the aryl/alkylcrosselectrophilecoupling via piezoelectricity-mediated radical generation from alkylhalides. Both benzotriazinones and alkyl (pseudo)halides display reactivities in the mechanoredox/nickel cocatalysis different from those of conventional thermal chemistry in solution. The scope of the reaction is demonstrated with 26 examples, showing