1: indole-2,3-dione With sodium hydride in N,N-dimethyl-formamide deprotonation; 0.25 h; 2: With chloro-trimethyl-silane in acetonitrile T=50°C; silylation; 1 h; 3: para-chlorophenyl chloromethyl ketone in N,N-dimethyl-formamide T=120°C; Condensation; 3 h;

1: indole-2,3-dione With polymeric BEMP in acetonitrile T=25°C; deprotonation; 0.166667 h; 2: 2-bromo-1-(4-chloro-phenyl)-ethanone in acetonitrile T=45°C; Alkylation; 16 h;