toluene-4-sulfonic acid in ethanol 0.5 h; Heating;

1: 59.3 percent / hydrogen / 10percent palladium on calcium carbonate / tetrahydrofuran; methanol / 2 h 2: 13.7 percent / p-toluenesulfonic acid monohydrate / ethanol / 0.5 h / Heating View Scheme

1: 78.8 percent / 16percent methanolic ammonia / methanol / 67 h / 5 °C 2: 59.3 percent / hydrogen / 10percent palladium on calcium carbonate / tetrahydrofuran; methanol / 2 h 3: 13.7 percent / p-toluenesulfonic acid monohydrate / ethanol / 0.5 h / Heating View Scheme

1: 74.4 percent / 1-hydroxybenzotriazole, triethylamine / dicyclohexylcarbodiimide / tetrahydrofuran; methanol / 16 h / Ambient temperature 2: 78.8 percent / 16percent methanolic ammonia / methanol / 67 h / 5 °C 3: 59.3 percent / hydrogen / 10percent palladium on calcium carbonate / tetrahydrofuran; methanol / 2 h 4: 13.7 percent / p-toluenesulfonic acid monohydrate / ethanol / 0.5 h / Heating View Scheme