Synthesis of 6-methyl-6H-indolo[3,2-c]isoquinoline and 6-methyl-6H-indolo[2,3-c]isoquinoline: two new unnatural isoquinoline isomers of the cryptolepine series
作者:Gitte Van Baelen、Caroline Meyers、Guy L.F. Lemière、Steven Hostyn、Roger Dommisse、Louis Maes、Koen Augustyns、Achiel Haemers、Luc Pieters、Bert U.W. Maes
DOI:10.1016/j.tet.2008.08.116
日期:2008.12
11H-indolo[3,2-c]isoquinoline has been synthesized in two steps starting from 4-bromoisoquinoline and 2-bromoaniline via a selective Buchwald–Hartwig reaction followed by a Pd-catalyzed intramolecular direct arylation involving C(sp2)–H activation. The synthesis of 7H-indolo[2,3-c]isoquinoline was achieved by a combination of a Suzuki reaction with an intramolecular nitrene insertion reaction starting from
11 H-吲哚并[3,2- c ]异喹啉通过选择性的布赫瓦尔德-哈特维格反应,然后经钯催化的涉及C(sp 2)的分子内直接芳基化反应,从4-溴异喹啉和2-溴苯胺开始分两步合成。H激活。7 H-吲哚并[2,3- c ]异喹啉的合成是通过Suzuki反应与从4-溴异喹啉和2-[(2,2-二甲基丙酰基)氨基]苯基开始的分子内氮插入反应的结合而实现的}硼酸。四环骨架的选择性甲基化产生标题化合物6-甲基-6 H-吲哚并[3,2- c ]异喹啉和6-甲基-6 H-吲哚并[2,3-c ]异喹啉,以前在文献中从未描述过。