Pyrene boronic acid cyclic ester: a new fast self-recovering mechanoluminescent material at room temperature
作者:Taisheng Wang、Na Zhang、Ke Zhang、Jingwen Dai、Wei Bai、Ruke Bai
DOI:10.1039/c6cc03248f
日期:——
Two pyrene boronic acid cyclic esters, PPB and NPB, were prepared and their solid state fluorescent properties were investigated. Interestingly, the results showed that PPB with 5-membered ring possesses reversibly...
Atropo‐Enantioselective Oxidation‐Enabled Iridium(III)‐Catalyzed C−H Arylations with Aryl Boronic Esters
作者:Łukasz Woźniak、Nicolai Cramer
DOI:10.1002/anie.202106403
日期:2021.8.16
Atropo-enantioselective biaryl coupling through C−H bond functionalization is an emerging technology allowing direct construction of axiallychiral molecules. This approach is largely limited to electrophilic coupling partners. We report a highly atropo-enantioselectiveC−Harylation of tetralone derivatives paired with aryl boronic esters as nucleophilic components. The transformation is catalyzed
activation of fluorinatedalkenes and arenes was developed. In this Pd-catalyzed Suzuki–Miyaura-type cross-coupling reaction, neither a base for enhancing the reactivity of the organoboron reagents nor a Lewis acid for promoting C–F bond activation was required. A fluoropalladium intermediate played an essential role in this reaction. In addition, a Ni(NHC) catalyst was efficient for C–C coupling through
Palladium-catalyzed Suzuki reactions of brominated flavin derivatives (5-deazaflavins, alloxazines, and isoalloxazines) with boronic acids or boronic acid esters that occur readily under mild conditions were shown to be an effective tool for the synthesis of a broad range of 7/8-arylflavins. In general, the introduction of an aryl/heteroaryl group by means of a direct C–C bond has been shown to be