cycloadditions of dienes to some 5-ylidene-2(5)-furanones have been examined from experimental and theoretical points of view. The role that different substituents play on directing the observed site-selectivity (endocyclic or exocyclic double bond at the dienophile counterpart) is discussed. Several new potential synthetic building blocks have been prepared in good yields.
已经从实验和理论的角度研究了二烯与一些5-亚丙基-2(5 )-
呋喃酮的Diels-Alder环加成反应。讨论了不同取代基在指导所观察到的位点选择性(亲双烯体对应物上的内环或外环双键)方面所起的作用。已经以高收率制备了几种新的潜在合成构件。