1: 48 percent / (R,R')-α,α'-dimethyldibenzylamide, nBuLi / tetrahydrofuran / -100 °C 2: 1.) O3; 2.) NaBH4; 3.) 2N HCl / 1.) MeOH, -78 deg C; 2.) MeOH, r.t.; 3.) r.t. 3: 3N KOH / Ambient temperature 4: diethyl ether / 0 °C 5: 97 percent / diphenylphosphoryl azide, triphenylphosphine, diethyl azodicarboxylate / tetrahydrofuran / 0 °C 6: Mg / methanol / Ambient temperature View Scheme