1: (E)-2-methyl-2-butenoic acid With oxalyl dichloride in diethyl ether; N,N-dimethyl-formamide T=20°C; 2 h; Inert atmosphere; 2: 4-methoxy-aniline With triethylamine in diethyl ether; N,N-dimethyl-formamide T=20°C; 2 h; Inert atmosphere;

in dichloromethane 2 h; Ambient temperature;

in dichloromethane 2 h; Ambient temperature;