Chemoselective Palladium-Catalyzed Direct C-H Arylation of 5-Carboxyimidazoles: Unparalleled Access to Fused Imidazole-Based Tricycles Containing Six-, Seven- or Eight-Membered Rings
作者:Jérémy Thireau、Cédric Schneider、Christine Baudequin、Sandrine Gaurrand、Patrick Angibaud、Lieven Meerpoel、Vincent Levacher、Olivier Querolle、Christophe Hoarau
DOI:10.1002/ejoc.201700297
日期:2017.5.3
without CuI assistance in 1,4-dioxane as a low-polarity solvent was explored. The method was suitable for the synthesis of fused imidazole-based tricyclic systems incorporating medium-sized rings, including, for the first time, eight-membered rings, which are valuable in modern drug design.
对化学选择性 Pd 催化的 N-苄基化 5-羧基咪唑与卤化物在作为低极性溶剂的 1,4-二恶烷中有或没有 CuI 辅助的分子间和分子内直接 C-H 芳基化进行了广泛的研究。该方法适用于合成包含中等大小环的稠合咪唑基三环系统,包括首次在现代药物设计中有价值的八元环。