B-Alkyl Suzuki–Miyaura cross-coupling of tri-n-alkylboranes with arylbromides bearing acidic functions under mild non-aqueous conditions
摘要:
An efficient and chemoselective Pd-catalyzed B-alkyl Suzuki-Miyaura cross-coupling of tri-n-alkylboranes with arylbromides possessing acidic functions is described. This protocol features the relatively weak base CS2CO3 and mild non-aqueous conditions. Aldehydes, ketones, nitriles, and chloro substitution are all tolerated. (C) 2009 Elsevier Ltd. All rights reserved.
Direct B-Alkyl Suzuki-Miyaura Cross-Coupling of Trialkyl- boranes with Aryl Bromides in the Presence of Unmasked Acidic or Basic Functions and Base-Labile Protections under Mild Non-Aqueous Conditions
作者:Bing Wang、Hui-Xia Sun、Zhi-Hua Sun、Guo-Qiang Lin
DOI:10.1002/adsc.200800630
日期:2009.2
Abstractmagnified imageAn efficient and chemoselective palladium‐catalyzed direct B‐alkyl Suzuki–Miyaura cross‐coupling of trialkylboranes with diversely functionalized aryl bromides is described. A wide variety of unmasked acidic or basic functions are tolerated. The mild non‐aqueous conditions are compatible with aldehydes, ketones, nitriles, chloro substitution as well as base‐labile phenolic Piv and TBS protecting groups. The anhydrous conditions were found to be advantageous for aryl bromide substrates. A potent CEPT inhibitor was efficiently synthesised using this protocol.