Disclosed are electroluminescent devices that comprise organic layers that contain certain organic compounds containing one ore more pyrimidine moieties. The organic compounds containing one ore more pyrimidine moieties are suitable components of blue-emitting, durable, organo-electroluminescent layers. The electroluminescent devices may be employed for full color display panels in for example mobile phones, televisions and personal computer screens.
A base‐mediateddecarboxylative [3+2] annulation of trimethylsilylethynyl benzoxazinanones and benzimidamides hydrochloride was achieved under mild reaction conditions to give various imidazolederivatives in high yields. Notably, it demonstrated a new reaction mode of alkynyl benzoxazinanones.
A copper-catalyzed approach for the synthesis of asymmetrical disubstituted 1,2,4-thiadiazoles via elemental sulfur-mediated decarboxylative redox cyclization
作者:Yafei Liu、Yurong Zhang、Jun Zhang、Liang Hu、Shiqing Han
DOI:10.1016/j.tetlet.2020.152744
日期:2021.2
The variety of asymmetricaldisubstituted 1,2,4-thiadiazoles are smoothly prepared by copper-catalyzed approach, which employed arylacetic acids and amidines as substrates, and elemental sulfur to mediate decarboxylative redox cyclization. The advantages of this method are simple, efficient, and ligand-free. In addition, this method can provide products in moderate to good yields.
dehydrocyclization of vicinal diols and amidines to access structurally diverse imidazolones, a class of valuable compounds found in numerous natural and biomedical products. The developed catalytic transformation proceeds with broad substrate scope, good functional group compability, the use of green molecular oxygen and reusable cobalt catalyst, which offers an important platform for the conversion of abundant
A Co-catalyzed highly chemo- and regio-selective nitration of C(sp3)-H was developed. Diverse aliphaticnitrocompounds were obtained in good yields, using t-BuONO as nitrating reagent. Specific nitration of C(sp3)-H instead of C(sp2)-H was achieved via a radical process rather than concerted metalation-deprotonation.