Non-Deprotonative Primary and Secondary Amination of (Hetero)Arylmetals
摘要:
Herein we disclose a novel method for the facile transfer of primary (-NH2) and secondary amino groups (-NHR) to heteroaryl- as well as arylcuprates at low temperature without the need for precious metal catalysts, ligands, excess reagents, protecting and/or directing groups. This one-pot transformation allows unprecedented functional group tolerance and it is well suited for the amination of electron-rich, electron-deficient as well as structurally complex (hetero)arylmetals. In some of the cases, only catalytic amounts of a copper(I) salt is required.
5-Substituted-2-furaldehydes: A Synthetic Protocol Utilizing an Organozinc Route
作者:Seung-Hoi Kim、Reuben D. Rieke
DOI:10.1021/jo301836x
日期:2013.3.1
5-bromo-2-furaldehyde or utilization of a neworganozinc reagent, 5-(1,3-dioxolan-2-yl)-2-furanylzinc bromide, which was easily prepared by the direct insertion of highly active zinc to 2-(5-bromofuran-2-yl-1,3-dioxolane. Of special note is the uniqueness of using a neworganozinc reagent, representing a first example of the direct synthesis of the corresponding organozinc halide. The subsequent coupling reactions
A convenient synthesis of 5-aryl- and 5-heteroaryl-2-furaldehydes by the cross-coupling reaction of organozincs
作者:Seung-Hoi Kim、Reuben D. Rieke
DOI:10.1016/j.tetlet.2010.03.035
日期:2010.5
An efficient synthetic route for the preparation of 5-heteroaryl- and 5-aryl-2-furaldehydes has been developed. It has been accomplished by the palladium(0)-catalyzed cross-coupling reaction of heteroarylzinc and arylzinc reagents with 5-bromo-2-furaldehyde under very mild conditions. (C) 2010 Elsevier Ltd. All rights reserved.