Yamamoto, Takeshi published the artcileRhodium-catalyzed C(sp2)-H addition of arylboronic acids to alkynes using a boron-based, convertible ortho-directing group, Category: pyrazoles-derivatives, the main research area is diarylacrylate dioxaborolanyl diarylethene preparation regioselective diastereoselective; arylboronic acid preparation alkyne addition rhodium catalyst; pyrazolylaniline directed arylboronate borylation.
Temporary modification of a boronyl group with pyrazolylaniline allowed insertion of arylpropiolates and diphenylacetylenes into ortho-C-H bond of arylboronic acids in the presence of rhodium catalysts, giving 3,3-diarylacrylates I [R1 = H, Me, OMe, CF3; R2 = H, Me, Br, OMe, CF3; R3 = H, OMe; R4 = Ph, 1-naphthyl, 2-naphthyl, etc.; R5 = CO2Et, C6H5, 4-CF3C6H4] and diarylethenes II containing aryl groups bearing an o-boryl group stereoselectively. The boronyl group in the 3,3-diarylacrylate I [R1 = R2 = R3 = H, R4 = Ph, R5 = CO2Et] was converted into various functional groups, including chlorine, hydrogen, hydroxy, and aromatic groups.
Chemistry Letters published new progress about Addition reaction catalysts, stereoselective. 111562-32-4 belongs to class pyrazoles-derivatives, name is 2-(1H-Pyrazol-3-yl)aniline, and the molecular formula is C9H9N3, Category: pyrazoles-derivatives.
Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics