1: 1.) diisopropylamine, n-BuLi / 1.) a.) THF, 0 deg C, 1 h, b.) 30-35 deg C, 0.5 h, 2.) 0 deg C to RT, 4 h 2: 93 percent / lithium triethylborohydride / tetrahydrofuran / 18 h / Ambient temperature View Scheme

sodium tetrahydroborate; triethyloxonium tetra-fluoroborate 1.) CH2Cl2, 20 deg C, 20 h, 2.) ethanol, 20 deg C, 20 h; Yield given. Multistep reaction;