A unified method for direct C4–H halogenation of indoles has been accomplished with the assistance of anthranilic acids as suitable transient directing groups. Exclusive site selectivity (one out of five potential reactive sites) as well as good functional group tolerance was obtained to install three kinds of halogen atoms (Cl, Br and I, respectively) by using inexpensive N-halosuccinimides (NXS)
A convenient preparation of 4-iodoindoles from indoles: application to the chemical synthesis of hapalindole alkaloids
作者:Martyn A Brown、Michael A Kerr
DOI:10.1016/s0040-4039(00)02194-8
日期:2001.2
were synthesized via regioselective chloromercuration and subsequent iodination of a series of N-p-toluenesulfonyl indoles bearing a variety of substituents at the 3-position This procedure allows rapid access to 3,4-dihaloindoles which may be used as synthetic precursors to indolealkaloids.