Functional desymmetrization of 1,3-dioximes for the obtention of 1,2,3-hetero trisubstituted carbocycles
作者:Valdemar B.C. Figueira、Arantxa G. Esqué、Ravi Varala、Concepción González-Bello、Sundaresan Prabhakar、Ana M. Lobo
DOI:10.1016/j.tetlet.2010.02.048
日期:2010.4
Carbocylic 1,3-dioximes react with acyl chlorides giving systems that may, upon heating, suffer [3,3]-sigmatropic rearrangements in high yields in only one of the oximes esters, yielding 1,3-dinitrogen-2-oxygen trisubstituted carbocycles. Use of more reactive electrophiles, such as p-toluenesulfonyl chloride and diethyl chlorophosphate, introduces the halogen at position 2, while cleaving the N-O bond of just one of the oxime functions. (C) 2010 Elsevier Ltd. All rights reserved.