1: 1) molecular sieves 4 Angstroem, Ag-triflate / 1) CH2Cl2, -78 deg C, 0.5h, 2a) -78 deg C, 1h, 2b) -78 deg C to RT, 12h 2: NaOMe / methanol / Ambient temperature 3: H2 / 5percent Pd-C / methanol / 760 Torr / 5-6h View Scheme

sodium dihydrogenphosphate; zinc in ethyl acetate T=20°C; 3 h;