1: 98 percent / m-hydrochloric acid / tetrahydrofuran / 12 h 2: 92 percent / aqueous potassium hydroxide / methanol / 24 h / 20 °C 3: 85 percent / lithium 1,1-dimethylethanethiolate / hexamethylphosphoric acid triamide / 2 h / 70 °C 4: 51 mg / H2 / 5percent Pd-C / ethyl acetate 5: 33 percent / sodium borohydride / methanol / 3 h View Scheme

1: 98 percent / m-hydrochloric acid / tetrahydrofuran / 12 h 2: 92 percent / aqueous potassium hydroxide / methanol / 24 h / 20 °C 3: 85 percent / lithium 1,1-dimethylethanethiolate / hexamethylphosphoric acid triamide / 2 h / 70 °C 4: 51 mg / H2 / 5percent Pd-C / ethyl acetate View Scheme

1: 98 percent / m-hydrochloric acid / tetrahydrofuran / 12 h 2: 92 percent / aqueous potassium hydroxide / methanol / 24 h / 20 °C 3: 85 percent / lithium 1,1-dimethylethanethiolate / hexamethylphosphoric acid triamide / 2 h / 70 °C 4: 51 mg / H2 / 5percent Pd-C / ethyl acetate 5: 7 percent / sodium borohydride / methanol / 3 h View Scheme