(i) Et2O, (ii) H2O, (heating); Multistep reaction;

1: With 2-nitro-benzenesulfonyl chloride; N-ethyl-N,N-diisopropylamine in acetonitrile T=0 - 65°C; Tiemann Rearrangement; 3 h; Inert atmosphere; 2: With silica gel Tiemann Rearrangement;