and high yielding synthesis (mean yield = 83%) of various 4-aryl, 4-heteroaryl, and 4-styryl-1,2-dimethyl-5-nitro-1H-imidazoles by palladium-catalyzed Suzuki-Miyauracross-coupling reactions usingmicrowaveirradiation is described. cross-coupling - 5-nitroimidazoles - palladium - Suzuki reaction - arylations
C-H Arylation of Nitroimidazoles and Nitropyrazoles Guided by the Electronic Effect of the Nitro Group
作者:Haeun Jung、Seri Bae、Ha-Lim Jang、Jung Min Joo
DOI:10.5012/bkcs.2014.35.10.3009
日期:2014.10.20
palladium-catalyzed C–H arylation reaction of nitroimidazoles and nitropyrazoles was developed using aryl bromides as arene donors. The electron-withdrawing effect of the nitrogroup allows for direct C–H arylation reactions of the nitro diazoles with high regioselectivity under mild conditions. The new C–H arylation approach is thus complementary to nucleophilicsubstitutionreactions, enabling the preparation