phosphoric acid; dimethyl sulfoxide; dicyclohexyl-carbodiimide 1.5 h; Ambient temperature;

1: 2) m-chloroperbenzoic acid / 1) Pd(PPh3)4 / 1) dioxane, hexane, reflux, 2) CHCl3, rt 2: 59 percent / Heating 3: 70 percent / aq. NaOH / methanol / 1.5 h / Ambient temperature 4: 25 percent / DMSO, N,N'-dicyclohexylcarbodiimide, H3PO4 / 1.5 h / Ambient temperature View Scheme

1: 59 percent / Heating 2: 70 percent / aq. NaOH / methanol / 1.5 h / Ambient temperature 3: 25 percent / DMSO, N,N'-dicyclohexylcarbodiimide, H3PO4 / 1.5 h / Ambient temperature View Scheme

1: 70 percent / aq. NaOH / methanol / 1.5 h / Ambient temperature 2: 25 percent / DMSO, N,N'-dicyclohexylcarbodiimide, H3PO4 / 1.5 h / Ambient temperature View Scheme