1.1: 92 percent / DMAP; DCC; CSA / CH2Cl2 / 20 °C 2.1: 70 percent / Zn(BH4)2 / diethyl ether / 1 h / -94 °C 3.1: 88 percent / (i-Pr)2NEt / CH2Cl2 / 16 h / 20 °C 4.1: 93 percent / DDQ / CH2Cl2; H2O / 0.5 h / 20 °C 5.1: NaHCO3; NBS / acetone; H2O / 2 h / -15 °C 5.2: furan; pyridine / acetone; H2O / 20 °C 6.1: NaClO2; 2-methyl-2-butene / 2-methyl-propan-2-ol; H2O; various solvent(s) / 2 h / 20 °C 7.1: Cl3C6H2COCl; Et3N / tetrahydrofuran / 2 h / 20 °C 7.2: 55 mg / DMAP / toluene / 5 h / 40 °C 8.1: 92 percent / CF3CO2H / CH2Cl2 / 1.5 h / 20 °C 9.1: NaBH4 / methanol / 1 h / 0 °C View Scheme