1: 91 percent / camphor sulfonic acid 2: 75 percent / pyridine / CH2Cl2 3: 84 percent / acetic acid, water 4: 71 percent / imidazole / dimethylformamide 5: 95 percent / pyridine / CH2Cl2 6: 86 percent / 1.) H2; 2.) sodium acetate / 1.) palladium black / 1.) ethyl acetate; 2.) acetonitrile 7: lithium triethylborohydride / tetrahydrofuran 8: 1percent HCl / methanol View Scheme