1: 2.)H2SO4 / 1. and 2. MeOH 2: 60 percent / aq. HCl / acetone / Heating 3: 1.) DBN 2.) pyrrolidine, HOAc 4: 59 percent / BF3*Et2O / CH2Cl2 / 0 °C 5: diisobutylaluminum hydride (DIBAL) / toluene / -78 °C 6: 53 percent / sodium cyanoborohydride (NaCNBH3) / 2-methyl-propan-2-ol 7: N-chlorosuccinimide, AgNO3 / acetonitrile View Scheme