1: 2,3-dihydro-5-chloroindole With n-butyllithium in diethyl ether; hexane T=0 - 20°C; 1 h; Inert atmosphereSchlenk technique; 2: N,N-dimethylcarbamoyl chloride in diethyl ether; hexane T=0 - 20°C; 14 h; Inert atmosphereSchlenk technique;