tetrakis(triphenylphosphine) palladium(0) in 1,4-dioxane 14 h; Heating;

T=210 - 220°C; Claisen rearrangement; 0.833333 h; Inert atmosphere;

1: 1.) NaOH, Adogen 464 / 1) CH2Cl2, water, rt, 30 min; 2) CH2Cl2, water, 0 deg C, 1 h 2: 1.) n-BuLi, 2.) I2 / 1) THF, pentane, -60 deg C, 2 h; 2) THF, pentane, -60 deg C --> rt, 1 h 3: 66 percent / copper bronze / dimethylformamide / 3 h / Heating 4: 1.) n-BuLi, 2.) I2 / 1) THF, pentane, -60 deg C, 2 h; 2) THF, pentane, -60 deg C --> rt, 1 h 5: 82 percent / tetrakis(triphenylphosphine)palladium(0) / dioxane / 14 h / Heating View Scheme

1: 1.) n-BuLi, 2.) I2 / 1) THF, pentane, -60 deg C, 2 h; 2) THF, pentane, -60 deg C --> rt, 1 h 2: 66 percent / copper bronze / dimethylformamide / 3 h / Heating 3: 1.) n-BuLi, 2.) I2 / 1) THF, pentane, -60 deg C, 2 h; 2) THF, pentane, -60 deg C --> rt, 1 h 4: 82 percent / tetrakis(triphenylphosphine)palladium(0) / dioxane / 14 h / Heating View Scheme

1: 66 percent / copper bronze / dimethylformamide / 3 h / Heating 2: 1.) n-BuLi, 2.) I2 / 1) THF, pentane, -60 deg C, 2 h; 2) THF, pentane, -60 deg C --> rt, 1 h 3: 82 percent / tetrakis(triphenylphosphine)palladium(0) / dioxane / 14 h / Heating View Scheme

1: 1.) n-BuLi, 2.) I2 / 1) THF, pentane, -60 deg C, 2 h; 2) THF, pentane, -60 deg C --> rt, 1 h 2: 82 percent / tetrakis(triphenylphosphine)palladium(0) / dioxane / 14 h / Heating View Scheme

1: 1.) O3, 1.) dimethyl sulfide / 1) 1,2-dichloroethane, -78 deg C; 2) 1,2-dichloroethane, -78 deg C, 1 h, 0 deg C, 1 h, rt, 1 h 2: 75 percent / sodium triacetoxyborohydride / 1,2-dichloro-ethane / 0.17 h / Ambient temperature View Scheme