在本文中,提出了在有氧或无氧条件下通过Rh(III)催化的2-炔基苯胺的逐步二聚反应,空前选择性地合成吲哚[3,2- c ]喹啉或3-(2-氨基苯基)喹啉衍生物。值得注意的是,发现六氟异丙醇是这些反应成功的关键溶剂和促进剂。另外,如此获得的产物的实用性通过它们容易地转化成药学上和光物理上重要的萘啶衍生物而得以展示。
Unexpected cyclization of 2-(2-aminophenyl)indoles with nitroalkenes to furnish indolo[3,2-<i>c</i>]quinolines
作者:Alexander V. Aksenov、Dmitrii A. Aksenov、Georgii D. Griaznov、Nicolai A. Aksenov、Leonid G. Voskressensky、Michael Rubin
DOI:10.1039/c8ob00588e
日期:——
A novel synthetic route to the indoloquinoline core of the alkaloid isocryptolepine involving an unprecedented PPA-mediated reaction of 2-(2-aminophenyl)indenes with nitroalkenes is discovered.
A new one-pot approach was developed to construct the 11H-indolo[3,2-c]quinoline scaffold through a gold-catalysed reaction of 2-[(2-aminophenyl)ethynyl]phenylamine derivatives with aldehydes. The broad scope and the high regioselectivity of this new protocol as well as the mild and neutral reaction conditions make it a viable alternative to the previously reported procedures.