反应详情

71.5 g (0.5 mol+10% excess) of maleic acid-monomethyl ester are reacted, in the manner described in Example 1, with 100 ml of triethylamine and 65.1 g (0.5 mol) of 3-diethylaminopropylamine. The reaction product is mixed with 500 ml of ether, the mixture is filtered and the residue is washed with ether. After drying at 60° C. in vacuo, the crude product is recrystallised in acetone to yield 69.44 g (53.4% of theory) of a white crystalline aspartic acid derivative, the melting point of which is 154.5°-156.5° C.

1. filtrationthe mixture is filtered
2. washthe residue is washed with ether
3. customAfter drying at 60° C. in vacuo
4. customthe crude product is recrystallised in acetone