The vinyl carbanion 2 undergoes cycloaromatization with α-oxoketene N,S-acetals 3 through 1,4-conjugate addition-elimination process to afford 3,5-diaminobiphenyls 4 in good yields.
乙烯基碳阴离子 2 与δ-
氧代
酮类 N,S-
乙醛 3 通过 1,4-共轭加成-消除过程发生环芳香化反应,以良好的收率得到 3,5-二
氨基
联苯 4。