1: With triethylsilane; trifluoroacetic acid in dichloromethane T=20°C; Reduction; 1.5 h; 2: With borane in tetrahydrofuran T=0 - 20°C; Addition; 3: With acetic acid T=20°C; Substitution; 6 h; Further stages.;

triethylsilane; trifluoroacetic acid in dichloromethane T=20°C; Dehydration; 1.5 h; Title compound not separated from byproducts.;