1: 82 percent / Et3N / 4-dimethylaminopiridine / acetone / 2 h / Ambient temperature 2: 71 percent / H2 / Pd/C 3: 78 percent / methylene blue, O2 / acetonitrile / 4 h / 20 °C / Irradiation View Scheme

1: 82 percent / Et3N / 4-dimethylaminopiridine / acetone / 2 h / Ambient temperature 2: 71 percent / H2 / Pd/C 3: 69 percent / methylene blue, O2 / methanol / 4 h / 20 °C / Irradiation View Scheme

hydrogen; palladium on activated charcoal in methanol P=3000.2 Torr; 12 h;