The γ-oxoketenes, which are formed from oxadiazinone 3a and strained cyclopentene derivatives, are shown to undergo a pericyclic ring enlargement to give the title compounds 2a, 2b and 5. In the case of 5, two configurations, one having a and the other a lactone functionality, are in equilibrium.
由恶二嗪酮3a和应变的
环戊烯衍
生物形成的γ-氧杂
环丁烷显示经过环周扩环,得到标题化合物2a,2b和5。在5的情况下,两种构型处于平衡,一种具有a ,另一种具有内酯官能度。