TBAI could catalyze the direct oxidative C-N coupling of 2-aminopyridines with β-keto esters and 1,3-diones, which affords imidazo[1,2-a]pyridines as the products. The reaction was realized under metal-free conditions by using tert-butyl hydroperoxide (TBHP) as the oxidant.
Advances have been made in the research
on color-tunable organic
ultralong room-temperature phosphorescence (OURTP) materials. Due
to the high cost of raw materials, complex and strict synthesis conditions,
and low yields, it is hard to obtain cheap commercial OURTP materials
within a short time. Therefore, it is of practical significance to
research and develop new OURTP functions based on commercialized organic
materials. In this study, the OURTP characteristics of melamine (MEL),
a kind of commercially available, cheap, and pure organic material,
were investigated and explored. MEL was found with color-tunable and
excellent OURTP, the average lifetime can reach 0.74 s, and the phosphorescence
quantum yield can reach 17%. Since the ratio of molecular phosphorescence
of MEL to the ultralong phosphorescence mediated by H-aggregation
differs with the excitation wavelength and their luminescence life
spans are also different, the color of OURTP materials is dependent
on both excitation wavelength and time. Moreover, the OURTP characteristics
of MEL can be utilized in anticounterfeiting and information identification.
Short and sweet: (−)‐Isatisine A was constructed using common and inexpensive building blocks, such as indole and D‐ribose (see scheme). The synthesis features an unprecedented intramolecular C glycosylation of an indole and an oxidative ring contraction.
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