Pd(II)-catalyzed double cyclization of 1,2-diarylethynes bearing an N-methyl-N-[2-(methoxycarbonyl)ethyl]amino and an aminocarbonyl group at the ortho positions of the two aromatic rings afforded the tetracyclic N-[2-(methoxycarbonyl)ethyl]indoloisoquinolinones in good to excellent yields. The N-[2-(methoxycarbonyl)ethyl] group is readily removed under basic conditions (DBU, DMF, 120 °C) to afford the
Pd(II)催化的在两个芳环的邻位带有N-甲基-N- [2-(甲氧基羰基)乙基]
氨基和
氨基羰基的1,2-二芳基
乙炔的双环化反应得到四环N- [ 2-(甲氧基羰基)乙基]
吲哚异喹啉酮类化合物的收率高至优异。在碱性条件(
DBU,
DMF,120°C)下,N- [2-(甲氧羰基)乙基]基很容易被除去,以极好的收率得到相应的带有游离
吲哚基氮的四环。在其他Pd(II)和Pd(0)催化和
硒介导的转化中说明了作为可移动N保护基的2-(甲氧羰基)乙基。