Site-Selective Azaindole Arylation at the Azine and Azole Rings via N-Oxide Activation
摘要:
Subjection of N-methyl 6- and 7-azaindole N-oxides to a Pd(OAc)(2)/DavePhos catalyst system enables regioselective direct arylation of the azine ring. Following deoxygenation, 7-azaindole substrates undergo an additional regioselective azole direct arylation event in good yield.
Regioselective deoxygenative chalcogenation of 7-azindole <i>N</i>-oxides promoted by I<sub>2</sub>/PEG-200
作者:Shanshan Liu、Heng Yang、Lin-Yu Jiao、Jian-Hua Zhang、Chen Zhao、Yangmin Ma、Xiufang Yang
DOI:10.1039/c9ob02044f
日期:——
deoxygenative chalcogenation of 7-azindole N-oxides; the combination of an internal oxidant and a green solvent has been used successfully for the synthesis of mono- and dichalcogenyl 7-azaindoles which are of pharmaceutical interest. The regioselectivity is tunable by the variation of the reaction conditions. I2/PEG was established as an efficient and reusable catalytic system for C–H chalcogenation. This
Palladium‐Catalyzed Regioselective C−H Arylation of 4‐Azaindazole at C3, C5 and C7 Positions
作者:Soukaina Faarasse、Saïd El Kazzouli、Otmane Bourzikat、Stéphane Bourg、Samia Aci‐Sèche、Pascal Bonnet、Franck Suzenet、Gérald Guillaumet
DOI:10.1002/adsc.202001421
日期:2021.8.13
Direct and site-selective C5 and C7 palladium-catalyzed C−Harylations of 4-azaindazole N-oxide have been achieved. A bidentate ligand and Pd(OAc)2 catalyst in toluene promoted the activation of C5 position, while a phosphine ligand and PdCl2 catalyst in DMA directed the arylation at C7 position. Using this new method, the synthesis of C5, C7-diarylated 4-azaindazole N-oxides as well as the C3, C5