反应详情
EQUATION
反应方程式
REACTANTS
反应物
PRODUCTS
生成物
AUXILIARIES
试剂、催化剂与溶剂
PROCEDURE
实验过程
To a solution of Fmoc-Glu(OBut)-Arg(Pmc)-Val-Asp(OAllyl)-OBzl (SEQ ID NO: 37) (12.3 g, 10.3 mmol) in 105 mL of dichloromethane is added piperidine (3.5 g, 41.3 mmol) at ambient temperature. The mixture is stirred 2 hours, then diluted with heptane, concentrated to half volume, and left standing in the freezer overnight. The liquor is decanted from the oily residue, which is then taken up in dichloromethane. The solution is washed with 0.5M aqueous citric acid, water, and brine, dried (magnesium sulfate), filtered, and concentrated. The crude solid is triturated twice with heptane and filtered to give 9.0 g of Glu(OtBu)-(L)Arg(Pmc)-Val-Asp(OAllyl)-OBzl as a white powder. (Mcalc 970.2; M+1obsvd 971).
WORKUP
后处理
- concentrationconcentrated to half volume
- waitleft
- customstanding in the freezer overnight
- customThe liquor is decanted from the oily residue, which
- washThe solution is washed with 0.5M aqueous citric acid, water, and brine
- dry with materialdried (magnesium sulfate)
- filtrationfiltered
- concentrationconcentrated
- customThe crude solid is triturated twice with heptane
- filtrationfiltered