以乙腈为氰甲基源合成氰基化的偕二氟烯烃  

Synthesis of Cyanated Difluorostyrene Derivatives via S_N2' Cyanomethylation of α-(Trifluoromethyl) styrenes with Acetonitrile

作　　者：刘青雲 赵祥虎 李佳录 曹松[1] Liu Qingyun;Zhao Xianghu;Li Jialu;Cao Song(Shanghai Key Laboratory of Chemical Biology,School of Pharmacy,East China University of Science and Technology (ECUST),Shanghai 200237)

机构地区：[1]华东理工大学药学院上海市化学生物学(芳香杂环)重点实验室,上海200237

出　　处：《化学学报》2018年第12期945-950,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.21472043;21272070)资助~~

摘　　要：报道了以乙腈为氰甲基源,Li HMDS为碱,在室温下通过氰甲基化α-(三氟甲基)芳基乙烯,合成了一系列氰基化的偕二氟烯烃.该方法具有反应条件相对温和、反应迅速、操作简单、官能团兼容性较好、收率较高等优点.Nitriles are important structural motifs found in agrochemicals, pharmaceuticals, and natural products. Furthermore, nitriles are versatile synthetic precursors for organic synthesis because they can be easily converted into various functionalities, such as amides, ketones, esters, primary amines, aldehydes, carboxylic acids, and nitrogen-containing heterocycles. Therefore, the development of efficient methods for the synthesis of nitrile compounds has attracted much attention from synthetic chemists. Cyanomethylation of various substrates is a synthetically useful reaction because a variety of diversely cyano-containing compounds could be readily prepared. Acetonitrile is the simplest commercially available alkyl nitrile, which can act as the cyanomethyl carbanion source. The traditional method for the cyanomethylation of organic molecules is deprotonation of acetonitrile in the presence of strong base. Alternatively, transition-metal-catalyzed C—H bond activation of acetonitrile represents an attractive approach to cyanomethylated compounds due to its atom and step economy. In this communication, we developed a simple and highly efficient method for the synthesis of cyanated difluorostyrene derivatives by cyanomethylation of α-(trifluoromethyl)styrenes using cheap and commercially available acetonitrile as the CH2CN- source. The reaction proceeded smoothly in the presence of LiHMDS at room temperature and was finished within 1 h, affording the cyanated gem-difluoroalkenes in moderate to good yields. Furthermore, the cyanomethylation reaction exhibited good substrate scope and functional group compatibility. A general procedure for the cyanomethylation of α-(trifluoromethyl)styrenes with acetonitrile is as following: α-(trifluoromethyl)styrenes 1 (0.5 mmol) was dissolved in acetonitrile 2a (4 mL) at room temperature under argon atmosphere. Subsequently, a solution of the LiHMDS in THF (1.5 mL, 1.0 mol/L, 1.5 mmol, 3.0 equiv.) was added dropwise within 50 min and stirring was continued for further 10 min (mo

关 键 词：α-(三氟甲基)芳基乙烯 乙腈 氰甲基化 氰基化偕二氟芳基乙烯 

分 类 号：O621.3[理学—有机化学]