Aminocyanation by the Addition of N–CN Bonds to Arynes: Chemoselective Synthesis of 1,2-Bifunctional Aminobenzonitriles
摘要:
An efficient aminocyanation by the direct addition of aryl cyanamides to arynes is described, enabling incorporation of highly useful amino and cyano groups synchronously via cleavage of inert N-CN bonds, affording synthetically useful 1,2-bifunctional aminobenzonitriles. The postsynthetic functionalization of the aminocyanation products allows diverse formation of synthetically important derivatives such as drug molecule Ponstan and fused heterocycles.
A terphenyl phosphine as a highly efficient ligand for palladium-catalysed amination of aryl halides with 1° anilines
作者:Fabin Zhou、Lixue Zhang、Ji-cheng Shi
DOI:10.1016/j.jcat.2021.08.017
日期:2021.10
A terphenyl phosphine ligand (2,6-bis(2,4,6-triisopropylphenyl)phenyl-dicyclohexylphosphine, TXPhos) and its supported palladium complex [(TXPhos)(allyl)PdCl] have been developed and the catalyst system is highly efficient in amination of arylhalides with 1° anilines, especially effective for densely functionalized substrates including both partners possessing ortho-ester, acetyl, nitrile and nitro
A Copper-Catalyzed Tandem C-H <i>ortho</i>
-Hydroxylation and N-N Bond-Formation Transformation: Expedited Synthesis of 1-(<i>ortho</i>
-Hydroxyaryl)-1<i>H</i>
-indazoles
A Cu‐catalyzedC(sp2)–H ortho‐hydroxylation and N–N bond‐formationsequence is described for the synthesis of 1‐(ortho‐hydroxyaryl)‐1H‐indazoles by using pure oxygen as the terminal oxidant. The ortho‐arylamino N–H ketimine moiety serves as an effective directing group for C(sp2)–H oxidation. acac = acetylacetonate.