CuO nanoparticle catalysed synthesis of 2H-indazoles under ligand free conditions
作者:Nilufa Khatun、Anupal Gogoi、Pallabita Basu、Prasenjit Das、Bhisma K. Patel
DOI:10.1039/c3ra45298k
日期:——
A CuO nano catalysed one-pot synthesis of 2H-indazoles has been devised from easily accessible starting materials viz. 2-bromobenzaldehydes, primary amines and sodium azide under ligand free conditions. The nano CuO catalyst played an important role during the formation of the intermolecular C–N bond followed by the intramolecular N–N bond, providing 2H-indazoles. This method has a broad substrate scope with a high tolerance of a variety of functional groups. The catalyst can be recycled up to three times, however with slight decreases in the yields each time.
A tandem Heck–aza-Michael addition protocol for the one-pot synthesis of isoindolines from unprotected amines
作者:Ke Chen、Sumod A. Pullarkat
DOI:10.1039/c2ob25854d
日期:——
A palladacycle-catalyzed tandem Heck-intramolecular aza-Michael reaction protocol has been developed for the one-pot synthesis of 1-substituted isoindolines from N-unprotected 2-bromobenzylamines and acrylates with high yields.
Direct Acyl Radical Addition to 2<i>H</i>-Indazoles Using Ag-Catalyzed Decarboxylative Cross-Coupling of α-Keto Acids
作者:Ganganna Bogonda、Hun Young Kim、Kyungsoo Oh
DOI:10.1021/acs.orglett.8b00920
日期:2018.5.4
A direct acyl radical addition to 2H-indazoles has been achieved for the first time, where the less-aromatic quinonoid 2H-indazoles readily accepted radical species to the C-3 position. Motivated by the lack of direct acylation strategy for 2H-indazoles, the current method utilizes the radical acceptability of 2H-indazoles, discovering an ambient temperature reaction to provide facile access to a diverse
A cobalt-catalyzed synthesis of 1-aminoindenes via enantioselective [3 + 2] annulation is described. In this reaction, the desired products can be selectively prepared in either (R)- or (S)-form by the ligand-controlled synthesis, which is initiated by the cleavage of C–B, C–Br, or C–O bonds under very mild reaction conditions. In addition, this enantioselective cobalt catalysis provides high regioselectivity
A cobalt‐catalyzed dualannulation reaction for the synthesis of variously substituted indenoisoquinolinones from 2‐bromobenzaldehydes, amines, and methyl 2‐(ethynyl)benzoates has been developed. This method could also be applied to the synthesis of an array of highly functionalized bioactiveindenoisoquinolinones and their derivatives. A possible mechanism of the cobalt catalysis is proposed, involving