hydrogen; potassium hexacyanoferrate(III); palladium on activated charcoal 1. MeOH, atmospheric pressure, room temp., 2. MeOH, phosphate buffer of pH7, ice cooling, 2-3h; Yield given;

1: 1. sodium dithionite, 2. aq. HCl / 1. 50percent aq. THF 2: 89.4 percent / H2 / 10percent Pd/C / Ambient temperature View Scheme