1: 59 percent / Heating 2: 70 percent / aq. NaOH / methanol / 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