Aqueous and Visible-Light-Promoted C–H (Hetero)arylation of Uracil Derivatives with Diazoniums
作者:An-Di Liu、Zhao-Li Wang、Li Liu、Liang Cheng
DOI:10.1021/acs.joc.1c01799
日期:2021.12.3
Direct C5 (hetero)arylation of uracil and uridine substrates with (hetero)aryl diazoniumsalts under photoredox catalysis with blue light was reported. The coupling proceeds efficiently with diazoniumsalts and heterocycles in good functional group tolerance at room temperature in aqueous solution without transition-metal components. A plausible radical mechanism has been proposed.
Room-Temperature Gold-Catalysed Arylation of Heteroarenes: Complementarity to Palladium Catalysis
作者:Alexander J. Cresswell、Guy C. Lloyd-Jones
DOI:10.1002/chem.201602893
日期:2016.8.26
Tailoring of the pre‐catalyst, the oxidant and the arylsilane enables the first room‐temperature, gold‐catalysed, innate C−H arylation of heteroarenes. Regioselectivity is consistently high and, in some cases, distinct from that reported with palladium catalysis. Tolerance to halides and boronic esters, in both the heteroarene and silane partners, provides orthogonality to Suzuki–Miyaura coupling.