Sc(OTf)<sub>3</sub>Catalyzed Electrophilic Amination of Arenes: An Expeditious Synthesis of Aryl Hydrazides
作者:J. S. Yadav、B. V. S. Reddy、G. Veerendhar、R. Srinivasa Rao、K. Nagaiah
DOI:10.1246/cl.2002.318
日期:2002.3
Arenes react smoothly with diethyl azodicarboxylate in the presence of a catalytic amount of scandium triflate in dichloromethane at ambient temperature to afford the corresponding aryl hydrazides in high yields with high regioselectivity.
A [Cp*Rh(III)]-catalyzed electrophilicamination of arylboronic acids with diethyl azodicarboxylate (DEAD) was developed, and arylhydrazides were produced in excellent yields and selectivity. The analogous amination with the arylazocarboxylates afforded the corresponding N,N-diarylhydrazides. The electrophilicamination of arylboronic acids with azocarboxylates proceeds readily under mild conditions
The Mitsonubo reagent (triphenylphosphine and dialkyl azodicarboxylates) was employed as a potential anionic nucleophile in a reaction involving aryl halides to produce aryl hydrazides. Aryl iodides and bromides, with electron-withdrawing as well as electron-releasing groups on the aromatic ring, undergo coupling reactions in good yields. The optimized conditions are developed for aryl iodides at room
Mitsonubo 试剂(三苯基膦和偶氮二羧酸二烷基酯)在涉及芳基卤化物以产生芳基酰肼的反应中用作潜在的阴离子亲核试剂。芳基碘化物和溴化物在芳环上具有吸电子和放电子基团,以良好的产率进行偶联反应。开发了室温下芳基碘和 60-75 °C 芳基溴的优化条件。
A convenient method for the intermolecular N-arylation of hydrazides with aryl halides in the presence of a palladium catalyst, a MOP-type ligand, and Cs2CO3 is reported. The reaction gives coupling products in good to excellent yields and has a high tolerance towards a wide spectrum of functional groups.