The indole nucleus is a privileged scaffold that is highly prevalent in natural and synthetic compounds of medicinal interest.[1] It is found in many clinical therapeutic agents (eg, indomethacin, indorenate and indoramin) and endogenous biologically active substances (eg, serotonin, melatonin, tryptophan and brassinin). Molecules containing an indole nucleus display a diverse range of biological activities, such as anticancer, antidiabetic, ...