Sw. Mccombie et al., INDOLOCARBAZOLES .1. TOTAL SYNTHESIS AND PROTEIN-KINASE INHIBITING CHARACTERISTICS OF COMPOUNDS RELATED TO K-252C, Bioorganic & medicinal chemistry letters, 3(8), 1993, pp. 1537-1542
The condensation of indolo[2,3-a]-carbazole (12) with 2,5-dimethoxytet
rahydrofuran derivatives gave cyclofuranosylated compounds (e.g. 13),
which were converted via dibromocompounds to the dinitriles (e.g. 25).
Hydrolysis, hydrolysis-reduction and thiolysis afforded imides, lacta
ms (e.g. 27) and their thio analogs. These compounds were potent inhib
itors of the protein kinase C family.