Synthesis of Dibenzoheteropines of Group 13–16 Elements via Ring-Closing Metathesis
作者:Takanori Matsuda、Shinya Sato
DOI:10.1021/jo4001993
日期:2013.4.5
The ring-closingmetathesis (RCM) of bis(2-vinylphenyl)silanes in the presence of the second-generation Hoveyda–Grubbs catalyst in toluene at 100 °C afforded dibenzo[b,f]silepines in excellent yields. Other dibenzoheteropines of group 13–16 elements were also prepared via the RCM of the corresponding heteroatom-tethered dienes.
Dibenzothiepin-based redox pair and its analogues exhibit an electrochomic behavior with drastic change in the UV-Vis-NIR absorption, thus suitable for developing new bioimaging protocols. The structural change of the central seven-membered ring was found to be the key to gain electrochemical bistability upon two-electron transfer nearly at the same potential.
with sulfonylchlorides has been established via Suzuki-type radical cross-coupling. This approach allows for the synthesis of more than 50 sulfone examples enabled by photoredox catalysis under visible light radiation. Moreover, the title reaction is applied in late-stage functionalization of bioactive molecules, and further transformation of the resulting sulfones into 2-functionalized sulfones, borates