1: 87 percent / RuO4, NaIO4 / CCl4; acetonitrile; H2O 2: 62 percent / DPPA, Et3N / toluene / Heating 3: 98 percent / BF3*OEt2 / tetrahydrofuran 4: Et3N, 4-DMAP / tetrahydrofuran 5: Cs2CO3 / methanol 6: 1.) Dess-Martin reagent, NaClO2, 2-Me-2-butene, NaH2Po4 / 2-methyl-propan-2-ol; H2O View Scheme