Microwave-assisted nucleophilic cleavage of 5,7-dimethyl-2-phenyl-1-oxo-l<i>H</i>-pyrazolo[ 1,2-<i>a</i>]pyrazol-4-ylium-3-olate to α-phenylmalonamides
作者:Daniel E. Lynch、Gillian E. Spicer、Ian Mcclenaghan
DOI:10.1002/jhet.5570420716
日期:2005.11
Three α-phenylmalonamides have been prepared by the selective nucleophilic cleavage of 5,7-dimethyl-2-phenyl-1-oxo-1H-pyrazolo[1,2-a]pyrazol-4-ylium-3-olate in solventless microwave syntheses. The three weak nucleophiles employed were aniline, p-chloroaniline and m-toluidine. The α-phenylmalonamides of these three aniline derivatives could not be prepared using the previously reported solvent syntheses
在无溶剂微波条件下,通过选择性亲核裂解5,7-二甲基-2-苯基-1-氧-1- H-吡唑并[1,2 - a ]吡唑-4-基-3-醇酸酯制备了三种α-苯基丙二酰胺。合成。采用三种弱亲核体是苯胺,p -chloroaniline和米-甲苯胺。这三种苯胺衍生物的α-苯基丙二酰胺无法使用先前报道的溶剂通过3-氧代吡唑并[1,2 - a ]吡唑-8-基-1-油酸酯来制备。使用红外光谱,1 H nmr和电喷雾质谱对所有产品进行表征。起始吡唑并[[1,2-] a的单晶X射线结构]吡唑和α-phenylmalon-米-toluidide也报道。