unprecedented heteroannulation process created four chemical bonds in a single operation with the isocyano group acting formally as a polarized double bond and phenyl vinyl selenone as a latent 1,3‐dipole. The phenylselenonyl group played a triple role as an electron‐withdrawing group to activate the 1,4‐addition, a leaving group, and a latent oxidant in this transformation.
在催化量的Cs 2 CO 3存在下,烷基异
氰化物,
苯基
乙烯基硒酮和
水的反
应得到了
恶唑烷-2-
酮,收率很高。这种空前的异环化过程在一次操作中产生了四个
化学键,异
氰基在形式上起极化双键作用,
苯基
乙烯基硒酮起潜在的1,3-偶极作用。
苯基
硒壬基在该转化过程中作为吸电子基团发挥了三重作用,以激活1,4加成,一个离去基团和一个潜在的
氧化剂。