反应详情

H-Glu(OBzl)-OH (7.0 g, 29.5 mmol) was finely ground in a mortar and pestle and then stirred with 8.88 g (32.3 mmol) of Boc-Ala-OSu for 48 hours in 250 ml DMF in the presence of 6 ml N-methylmorpholine (NMM). Some more NMM was added to maintain the reaction slightly basic during the reaction. The solvent was evaporated and the residue partitioned between 30 ml ethyl acetate and 500 ml H2O containing 2 ml of 10% H2SO4. The organic layer was then washed three times with water, dried(Na2SO4) and evaporated to dryness. The product was taken up in a small volume of ether and treated with a large volume of petroleum ether. A white amorphous solid was obtained which was homogeneous on tlc: Yield, 11.0 g (91.5%); mp 84°-88°; [α]D25 = -8.08° (c l, DMF).

1. temperatureto maintain
2. customthe reaction
3. customslightly basic during the reaction
4. customThe solvent was evaporated
5. customthe residue partitioned between 30 ml ethyl acetate and 500 ml H2O containing 2 ml of 10% H2SO4
6. washThe organic layer was then washed three times with water, dried(Na2SO4)
7. customevaporated to dryness
8. additiontreated with a large volume of petroleum ether
9. customA white amorphous solid was obtained which
10. customYield