Synthesis of 4-(Phenylamino)quinazoline-2(1H)-selones and Diselenides from Isoselenocyanates:Dimroth Rearrangement of an Intermediate
作者:Plamen K. Atanassov、Anthony Linden、Heinz Heimgartner
DOI:10.1002/hlca.200490166
日期:2004.7
reaction mechanism via a Dimroth rearrangement of the primarily formed intermediate is presented in Scheme 3. The molecular structures of 10 and 11a have been established by X-ray crystallography. Unexpectedly, no selone or diselenide was obtained in the case of the reaction with 3-aminobenzo[b]furan-2-carbonitrile (14). The only product isolated was the selenide 16 (Scheme 4), the structure of which
在干燥的吡啶中,蒽腈8与苯基异鲸蜡氰酸酯(1a)在回流下反应,得到4-(苯基氨基)喹唑啉-2(1H)-硒酮9(方案2)。它们很容易被氧化并转化为11型二硒化物。8a与异硫氰酸苯酯(1b)的类似反应产生了喹唑啉-2(1H)-硫酮10(方案2)。方案3中给出了通过初步形成的中间体的狄莫罗斯重排反应的反应机理。通过X射线晶体学已经确定了图10和11a。出乎意料的是,在与3-氨基苯并[ b ]呋喃-2-甲腈(14)反应的情况下,没有获得硒酮或二硒化物。分离出的唯一产物是硒化物16(方案4),其结构已通过X射线晶体学确定。