Reactivity of α-arylidene benzoheteracyclanone dibromides toward azide ion: an effective approach to 3-(α-substituted-benzyl)chromones and -1-thiochromones
作者:Tamás Patonay、Zoltán Dinya、Albert Lévai、Dénes Molnár
DOI:10.1016/s0040-4020(01)00142-9
日期:2001.4
dibromides of 3-arylidenechromanones and -1-thiochromanones with sodium azide resulted in the formation of 3-(α-azidobenzyl)chromones and -1-thiochromones whereas dibromides having no antiperiplanar vicinal hydrogen in the ring such as flavanone, 1-thioflavanone and benzosuberone derivatives afforded only the parent enones by bromine elimination. Evidence supported the intermediacy of 3-(α-bromobenzyl)chromones
用叠氮化钠处理3-亚芳基苯并二氢吡喃酮和-1-硫代苯并二氢吡喃酮导致3-(α-叠氮基苄基)苯并二氢吡喃酮和-1-硫代苯并二氢吡喃酮的形成,而环中没有反平面邻位氢的二溴苯并酮例如黄烷酮,1-硫代黄烷酮。苯并亚砜酮衍生物通过溴消除仅提供母体烯酮。证据支持该反应中3-(α-溴苄基)色酮和-1-硫代色酮的中间性。这些假定的中间体以独立的方式制备,并以高收率转化为叠氮化物。