2.4. Synthesis of St-Gly-OEt 3
To a cooled solution of 3.21 g (5 mmol) of 2 in 4 ml CH2Cl2, 1.054 g (5.5 mmol) of EDC HCl (N-ethyl-N0-(3-dimethylaminopro- pyl) carbodiimide hydrochloride) and 0.99 g (5.5 mmol) potassium salt of Oxyma in 8 ml CH2Cl2 were added and stirred for 5 min. Then, 5 ml of a solution containing 0.767 g (5.5 mmol) H-Gly-OEt HCl and 1.2 g (11 mmol) Na2CO3 in H2O was added. The reaction mixture was stirred at 0 C for 1 h and then the reaction mixture was stirred overnight at room temperature.