This Letter describes the amination of 3-bromoisoxazoles by a nucleophilic aromatic substitution reaction. We have found 3-bromoisoxazoles to be inert to substitution under thermal conditions, however, the employment of phosphazene bases under microwave irradiation facilitates the amination process and allows the corresponding 3-aminoisoxazoles to be isolated in moderate yield. (C) 2004 Elsevier Ltd. All rights reserved.
作者:Joseph P. Harrity、Jane E. Moore、Katharine M. Goodenough、Daniel Spinks
DOI:10.1055/s-2002-35595
日期:——
been exploited in the preparation of 3-bromo- and 3-chloroisoxazolyl-4-boronates. The synthetic potential of these intermediates has been explored through a number of cross coupling reactions of the boronic ester unit and some representative reactions of the heteroaryl halide moiety.
作者:Jane E. Moore、Daniel Spinks、Joseph P.A. Harrity
DOI:10.1016/j.tetlet.2004.02.135
日期:2004.4
This Letter describes the amination of 3-bromoisoxazoles by a nucleophilic aromatic substitution reaction. We have found 3-bromoisoxazoles to be inert to substitution under thermal conditions, however, the employment of phosphazene bases under microwave irradiation facilitates the amination process and allows the corresponding 3-aminoisoxazoles to be isolated in moderate yield. (C) 2004 Elsevier Ltd. All rights reserved.