Palladium-Catalyzed ortho-Selective C—H Chlorination of Arenes Using Anodic Oxidation
Received date: 2019-04-19
Online published: 2019-05-08
Supported by
Project supported by the National Natural Science Foundation of China(Nos. 21772222);Project supported by the National Natural Science Foundation of China(21821002);Project supported by the National Natural Science Foundation of China(Nos. 2017KTSCX185);Project supported by the National Natural Science Foundation of China(2017KSYS010);Project supported by the National Natural Science Foundation of China(2016KCXTD005)
Aryl halides are key building blocks in organic synthesis for the construction of valuable natural products, medicinal and agricultural chemicals via transition metal-catalyzed coupling or substitution reactions. Halogenation is one of the most fundamental and important reactions in organic synthesis. Electrochemical transition-metal-catalyzed C—H functionalization has emerged as a powerful tool for molecular synthesis with the prospect of avoiding the use of costly and toxic oxidants or reductants, thereby reducing the footprint of undesirable, toxic byproducts. The palladium-catalyzed electrochemical C—H chlorination of benzamide derivatives directed by PIP amine directing group under divided cells has been demonstrated, in which readily available inorganic halides salts serve as halogen sources. The reaction features a broad substrate scope, high functional group tolerance, and compatibility of thiophene substrates. This reaction could be conducted on a gram scale, which is important for future application. Additionally, the sequential bromination and chlorination of C(sp 2)—H bond constructs highly functionalized aromatic carboxylic acid derivatives. The typical procedure is as follows: The electrolysis was carried out in an H-type divided cell (anion-exchange membrane), with a RVC anode (10 mm×10 mm×12 mm) and a platinum cathode (10 mm×10 mm×0.2 mm). The anodic chamber was charged with Pd(OAc)2 (5.6 mg, 0.025 mmol, 10 mol%) and benzamide derivative (0.25 mmol, 1.0 equiv.) and dissolved in DMF (10 mL). LiCl (847.8 mg, 20.0 mmol) was added in the cathodic chamber and dissolved in water (10 mL). Then the reaction mixture was electrolyzed under a constant current of 5 mA at 90 ℃ until the complete consumption of the starting material as monitored by TLC or 1H NMR. After the reaction, EtOAc (50 mL) was added to dilute the mixture and then washed with water (20 mL×3) and then with brine (20 mL). The organic fraction was dried over Na2SO4 and concentrated. The resulting residue was purified by silica gel flash chromatography to give the chlorination product.
Qi-Liang Yang, , Xiang-Yang Wang, , Xin-Jun Weng, , Xiang Yang, , Xue-Tao Xu, , Xiaofeng Tong, , Ping Fang, , Xin-Yan Wu, , Tian-Sheng Mei, . Palladium-Catalyzed ortho-Selective C—H Chlorination of Arenes Using Anodic Oxidation[J]. Acta Chimica Sinica, 2019 , 77(9) : 866 -873 . DOI: 10.6023/A19040135
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