Fluorohalogenation of
<i>gem</i>
‐Difluoroalkenes: Synthesis and Applications of α‐Trifluoromethyl Halides
作者:Chi Liu、Chuanle Zhu、Yingying Cai、Zhiyi Yang、Hao Zeng、Fulin Chen、Huanfeng Jiang
DOI:10.1002/chem.201905445
日期:2020.2.11
A novel strategy for 1,2-dihalogenation of alkenes is reported that occurs through a sequential nucleophilic halide addition and electrophilic halogenation. By trapping the in situ generated unstable α-trifluoromethyl carbanion intermediates derived from the nucleophilic fluoride addition to electron-poor gem-difluoroalkenes, this fluorohalogenation of gem-difluoroalkenes with electrophilic haloalkynes
据报道,通过顺序的亲核卤化物加成和亲电子卤化,发生了烯烃1,2-二卤化的新策略。通过将原位生成的不稳定的α-三氟甲基碳负离子中间体捕获到贫电子的宝石二氟烯烃中,并从亲核氟化物中衍生出来,这种宝石二氟烯烃与亲电子卤代炔烃的氟卤化反应可高产率地提供各种有用的α-三氟甲基卤化物。由这些获得的α-三氟甲基卤化物可以平稳地合成农药活性化合物和各种有吸引力的三氟甲基化分子。