The reactions of several substituted halopyrimidines with methyl vinyl in the presence of palladium diacetate-triphenylphosphine ketone complex in triethylamine are investigated. In the reactions of bromopyrimidines, the usual olefinic substituted products are obtained. But on using iodopyrimidines, the addition of pyrimidine to the carbon-carbon double bond of methyl vinyl ketone occurs to afford substituted 5-(3-oxobutyl)pyrimidines. Possible mechanisms are presented.
研究了几种取代卤
嘧啶与
醋酸双苯基
磷酸钯-酮复合物在
三乙胺存在下与甲基
乙烯反应的情况。在
溴嘧啶的反应中,获得了通常的烯烃取代产物。但使用
碘嘧啶时,
嘧啶与
甲基乙烯酮的碳碳双键发生加成,生成取代的5-(3-氧代丁基)
嘧啶。提出了可能的反应机制。