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Citation: Yu Xiaoye, Zhou Fan, Chen Jiarong, Xiao Wenjing. Visible Light Photocatalytic N-Radicalbased Intramolecular Hydroamination of Benzamides[J]. Acta Chimica Sinica, ;2017, 75(1): 86-91. doi: 10.6023/A16070367 shu

Visible Light Photocatalytic N-Radicalbased Intramolecular Hydroamination of Benzamides

  • Key Laboratory of Pesticide & Chemical Biology Ministry of Education and College of Chemistry, Central China Normal University, Wuhan 430079

  • Corresponding author: Chen Jiarong, chenjiarong@mail.ccnu.edu.cn
  • Received Date: 28 July 2016

    Fund Project: National Natural Science Foundation of China 21472058National Natural Science Foundation of China 21272087National Natural Science Foundation of China 21232003and the Youth Chen-Guang Project of Wuhan 2015070404010180National Natural Science Foundation of China 21472057

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  • The 3, 4-dihydroisoquinolinones are a privileged class of heterocyclic motifs and widely found in numerous biologically active compounds. Thus, the development of more efficient and practical methods for their synthesis is highly desirable. Traditional methods are typically focused on transition-metal catalyzed C-H functionalization. Inspired by the recent process of the visible light photocatalytic generation and exploration of N-radicals in organic synthesis, our group in 2014 developed a visible light-induced photocatalytic strategy for direct conversion of the N-H bonds of β, γ-unsaturated hydrazones into N-centred radicals for the first time, and used them in intramolecular radical hydroamination, enabling efficient synthesis of 4, 5-dihydropyrazole derivatives. By employing suitable additives or changing reaction parameters, we also successfully achieved highly regioselective 6-endo N-radical cyclization and oxyamination reactions based on N-centred radicals, providing the valuable 1, 6-dihydropyradazines, pyrazolines, and pyridazines in good yields. In the hope of extending such N-radical-mediated heterocycle synthesis further, we reported a transition-metal free and visible light photocatalytic N-radical-based intramolecular hydroamination of benzamides. The reaction provides a practical and efficient approach to various biologically important 3, 4-dihydroisoquinolinones with generally high yields. Importantly, the continuous flow reaction could significantly shorten the reaction time and still give rise to satisfactory yield. The sunlight irradiation reaction and gram-scale reaction also highlighted the potential synthetic utility of this method. A general procedure for the reaction is as follows:EosinY Na (6.21 mg, 0.009 mmol), NaOH (14.4 mg, 0.36 mmol), amide 1 (0.3 mmol) were dissolved in MeOH (6.0 mL), then, the resulting mixture was degassed via a 'freeze-pump-thaw' procedure (3 times). After that, the resulting mixture was stirred at a distance of ca. 5 cm from 3 W blue LEDs (450~460 nm) at room temperature until the starting amides were consumed as monitored by TLC analysis. After concentration in vacuo, the reaction residue was purified by flash chromatography on silica gel[V(petroleum ether)/V(ethyl acetate)=5:1~2:1] directly to give the desired product.
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