A series of beta-carbolin-2-ones and 3,10-dihydro-2H-azepino[3,4-b]indol-1-ones have been designed, synthesized, and evaluated as RET protein kinase inhibitors oil the basis Of their Structural similarity with the prototype indolin-2-one RPI-1. Some beta-carbolin-2-ones (structure 2) showed ail ability to inhibit RET enzymatic activity in vitro and proliferation of RETC634R oncogene-transformed NIH3T3 cells comparable to that of the reference compound. The docking analysis of the interaction of these compounds with the crystallographic structure of RET tyrosine kinase domain suggested a new binding interaction scheme different from the one proposed during their design. The rigid structure of the compounds of this series represents a new scaffold with potential advantages in the design of RET protein kinase inhibitors.
Intramolecular Friedel-Crafts Reaction of Indoles with Carbonyl Groups: A Simple Synthesis of 3- and 4-Substituted β-Carbolin-1-ones
The intramolecular Friedel-Crafts reaction of indole-2-carboxylic acid β-oxoamides catalyzed by trifluoroacetic acid or InCl 3 , is a convenient method for the synthesis of 3-aryl-, 4-aryl-, and 4-alkyl-β-carbolin-1-ones.