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Palladium‐Catalyzed [2+2+1] Spiroannulation via Alkyne‐Directed Remote C−H Arylation and Subsequent Arene Dearomatization
Author(s) -
Zuo Zhijun,
Wang Jing,
Liu Jingjing,
Wang Yaoyu,
Luan Xinjun
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201909557
Subject(s) - aryl , alkyne , alkene , chemistry , palladium , iodide , combinatorial chemistry , catalysis , coupling reaction , halide , organic chemistry , alkyl
Palladium‐catalyzed alkene‐directed cross‐coupling of aryl iodide with another aryl halide through C−H arylation opens a unique avenue for unsymmetrical biaryl‐derived molecules. However, homo‐coupling of aryl iodides often erodes the overall synthetic efficiency. Reported herein is a highly chemoselective Pd 0 ‐catalyzed alkyne‐directed cross‐coupling of aryl iodides with bromophenols, which was subsequently followed by phenol dearomatization to furnish a very attractive [2+2+1] spiroannulation. Notably, possible homo‐coupling of aryl iodides was not observed at all. Mechanistic studies indicated that a five‐membered aryl/vinyl palladacycle most likely accounts for promoting the key step of biaryl cross‐coupling.