作者:Raffet Velarde-Ortiz、Albert Guijarro、Reuben D. Rieke
DOI:10.1016/s0040-4039(98)02108-x
日期:1998.12
The reaction of several functionalized primary, secondary and tertiary organozinc bromides, benzylzinc bromide, functionalized arylzinc halides and one heteroarylzinc bromide with ditert-butyl azodicarboxylate is described. The reaction products, N,N'-ditert-butoxycarbonylhydrazino derivatives are obtained in excellent yields for most aliphatic substrates and good yields for aromatic substrates. These compounds are direct precursors of hydrazino and amino derivatives by deprotection. The process constitutes the first synthetically useful electrophilic amination of organozinc derivatives, and takes advantage of the broad functional group tolerance of the organozinc chemistry. (C) 1998 Elsevier Science Ltd. All rights reserved.
An Efficient Pd-Catalyzed Coupling of Hydrazine Derivatives with Aryl Halides
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.