5,6-Dihydro-1,3-dimethyl-6-methylene-5-[(substituted amino)methylene]-2,4(1H,3H)-pyrimidinedione intermediates (E) were characterized spectroscopically and chemically. The cycloaddition reaction of E with olefinic dienophiles was carried out in highly regio- and stereoselective manners to give quinazoline derivatives.
对 5,6-二氢-1,3-二甲基-6-亚甲基-5-[(取代
氨基)亚甲基]-2,4(1H,3H)-
嘧啶二酮中间体(E)进行了光谱学和
化学表征。E 与烯烃类亲二烯烃发生的环加成反应具有高度的区域和立体选择性,可得到
喹唑啉衍
生物。