反应详情

Boc-D-Ala-OH (5.68 g, 30 mmole) and H-Gly-OBzl.TosOH (10.6 g, 1.05 eq) were suspended in CH2Cl2. WSCI (6 ml, 1.1 eq) was added dropwise while cooling, and the solution was stirred overnight. The CH2Cl2 was distilled off. The residue was dissolved in AcOEt (500 ml); washed with 1N HCl, water, 5% NaHCO3, and water in order; and dried over Na2SO4. AcOEt was distilled off, and the residue was recrystalized twice with AcOEt/n-hexane to give the desired product (9.16 g, 90.7%).

1. additionWSCI (6 ml, 1.1 eq) was added dropwise
2. temperaturewhile cooling
3. distillationThe CH2Cl2 was distilled off
4. dissolutionThe residue was dissolved in AcOEt (500 ml)
5. washwashed with 1N HCl, water, 5% NaHCO3, and water in order
6. dry with materialand dried over Na2SO4
7. distillationAcOEt was distilled off
8. customthe residue was recrystalized twice with AcOEt/n-hexane