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Introduction: The pandemic of SARS-CoV-2 brings great challenge and threats to humans worldwide. Multiple variants of SARS-CoV-2 tend to be epidemic, among which Omicron is highly infectious within China. The aim of this study was to analyze the clinical characteristics of children infected with SARS-CoV-2 variant B.1.1.529 (Omicron) in the Shanghai, China.Methods: We included 9378 pediatric patients diagnosed with Omicron and treated in the Shanghai International Convention and Exhibition Center between April 1, 2022 and May 31, 2022. We recorded and summarized the clinical characteristics, infectious conditions and biological features of the children infected with Omicron.Results: A total of 9355 paediatric patients were treated in isolation since Makeshift became available, including 5564 males (59.48%) and 3791 females (40.52%). More than half (55.56%) of the affected children were identified at premises screening. The number of symptomatic or asymptomatic patients was 4530 (48.42%) and 4825 (51.58%), respectively. Initial signs or symptoms in asymptomatic patients included fatigue (3582, 38.29%), cough (560, 5.99%), fever (242, 2.59%) and other (146, 1.56%). Age and number of vaccinations in paediatric patients were negatively associated with the number of days from positive to negative nucleic acid test results.Conclusion: Age and number of vaccinations were key factors influencing the conversion of nucleic acid test results in paediatric patients. Early childhood vaccination is encouraged to establish a complete immune barrier. [ABSTRACT FROM AUTHOR]

Abstract: In this work, we achieved a site‐selective amination of 2‐arylimidazoheterocycles on the C3 position using photo‐induced external oxidant‐free strategy. The C−N bond formation with H2 evolution was realized via the oxidative C−H/N−H coupling. This protocol may have significant implications in the late‐modification of complicated drug molecules. In addition, we also used CV and DFT calculations to study the mechanism, which showed that the arene radical cation played an important role in accelerating the C−H amination process. [ABSTRACT FROM AUTHOR]

In this work, we develop an oxidation-induced C–H functionalization strategy, which not only leads to a new avenue to build C–N bonds, but also leads to different site-selectivity compared with “classic directing-groups”. The high selectivity of our new catalytic system originates from the heterogeneous electron-density distribution of the radical cation species which are induced by single electron transfer between the aromatics and oxidant-Cu(ii) species. [ABSTRACT FROM AUTHOR]

In this study, we broke through the directing function of the amide group. The coordination interaction between metal and directing-group enhanced the reactivity of the substrate. Using this strategy, we realized the selective amination of 8-aminoquinolines at the C5 position via employing azoles as the source of amine. Various kinds of 8-aminoquinolines and different substituted azoles were compatible to afford the corresponding C–N coupling products. [ABSTRACT FROM AUTHOR]