... Synlett 2004(4): 714 ... To a solution of 5a,b (Boc dervative; 110 mg, 0.402 mmol, Cbz dervative 155 mg, 504 mmol) in anhyd THF (5 mL) at -78 °C was added DIBAL-H (0.68 mL for Boc, 0.85 mL for Cbz) and the reaction micture was stirred for 1 h ... NH 4 Cl and extracted with EtOAc. ...