Cobalt-catalyzed cyclization with the introduction of cyano, acyl and aminoalkyl groups
作者:Hiroto Hori、Shigeru Arai、Atsushi Nishida
DOI:10.1039/c9ob00637k
日期:——
An efficient synthesis of carbo- and heterocycles using CC, CO and CN bonds undercobaltcatalysis is described. The substituents on olefins are key for controlling the regio- and chemoselectivity in the initial hydrogen atom transfer step and quaternary carbons are efficiently constructed under mild conditions. Cyclopropane cleavage and tandem cyclization give highly functionalized bicyclic skeletons
Ruthenium-Catalyzed Direct CH Amidation of Arenes Including Weakly Coordinating Aromatic Ketones
作者:Jiyu Kim、Jinwoo Kim、Sukbok Chang
DOI:10.1002/chem.201301025
日期:2013.6.3
CH activation: The ruthenium‐catalyzed direct sp2 CHamidation of arenes by using sulfonyl azides as the amino source is presented (see scheme). A wide range of substrates were readily amidated including arenes bearing weakly coordinating groups. Synthetic utility of the thus obtained products was demonstrated in the preparation of biologically active heterocycles.
An efficient Ru(II)-catalyzed intermolecularamidation of weakly coordinating ketones with sulfonyl azides via C-H bond activation is described. The reaction proceeds with high functional group tolerance, providing a novel approach to practical ketone-directed intermolecular C-N bond formation in the absence of an additional oxidant.
Construction of 3-oxyindoles via hypervalent iodine mediated tandem cyclization–acetoxylation of o-acyl anilines
作者:Yi Sun、Renhua Fan
DOI:10.1039/c0cc01911a
日期:——
An efficient tandem cyclizationâacetoxylation of o-acyl anilines mediated by the combination of iodobenzene diacetate with tetrabutylammonium iodide provides a new convenient and useful route to 2-acetoxy indolin-3-ones, which are ready to be converted into other 2-substituted 3-oxyindole derivatives.
offers a direct route to access synthetically valuable α-chiral primary amines, asymmetrictransferhydrogenation of NH imines has been rarely studied, due in large part to the inaccessibility and instability of NH imines. Herein, we report a Rh-catalyzed asymmetrictransferhydrogenation of a kind of novel and stable NH imines which are prepared via condensation of easily available sulfonylated 2’-aminoacetophenones