1: 31 percent / CSA / CH2Cl2 / 0.25 h 2: 1) (C6H11)2NMgBr / 1) THF, -55 deg C, 2) THF, -55 to -30 deg C, 1.2 h 3: 16 percent / DDQ / CH2Cl2; H2O / 1.5 h / Ambient temperature; phosphate buffer, pH = 6.86 View Scheme