potassium hydroxide in methanol 24 h;

1: 2-amino-benzenethiol With 4-methoxytrityl resin chloride; N-ethyl-N,N-diisopropylamine in dichloromethane T=20°C; 2: benzoic acid With diisopropyl-carbodiimide in N,N-dimethyl-formamide T=20°C; 3 h; 3: With triethylsilane; trifluoroacetic acid in dichloromethane Title compound not separated from byproducts;

Ersorb-4 in xylene T=130°C;

1: 19 percent / potassium hydroxide / H2O; tetrahydrofuran 2: 91 percent / potassium hydroxide / methanol / 24 h View Scheme

1: 78 percent / triethylamine / diethyl ether / 1 h / 20 °C 2: 91 percent / potassium hydroxide / methanol / 24 h View Scheme

1: 78 percent / triethylamine / diethyl ether / 1 h / 20 °C 2: 91 percent / potassium hydroxide / methanol / 24 h View Scheme

hydrogenchloride; methanol; zinc

Amberlyst-15 in water T=90°C; 0.5 h; Irradiation;