1: 4-nitro-benzoic acid With (E)-ethyl 2-cyano-2-(2-nitrophenylsulfonyloxyimino)acetate; N-ethyl-N,N-diisopropylamine in dichloromethane T=25°C; 2: β-naphthol in dichloromethane T=25°C;

sodium hydroxide; water

T=85°C;