D,L-2,6-Diaminopimelic-(2-14C) acid was prepared by alkylation of diethyl acetamidomalonate-(2-14C) with 5-bromo-N-phthaloyl-L-norvaline methyl ester and hydrolysis of the condensation product. Depending on the alkylation conditions, partial or complete racemisation takes place and therefore the L,L-form of diaminopimelic acid had to be isolated by paper chromatography. Alkylation of diethyl acetamidomalonate-(2-14C) with diethyl 4-bromobutyl- or 5-bromopentyl- or 6-bromohexylacetamidomalonate and subsequent hydrolysis of the condensation products gave D,L-2,7-diamino-suberic-(2-14C), D,L-2,8-diaminoazelaic-2-14C, and D,L-2,8-diaminosebacic-(2-14C) acids respectively.
D,L-2,6-二
氨基丙二酸-(2-14C)是通过
乙酰氨基丙二酸二乙酯-(2-14C)与 5-
溴-N-邻苯二甲酰-
L-正缬氨酸甲酯的烷基化反应以及缩合产物的
水解反应制备的。根据烷基化条件的不同,会发生部分或完全消旋化,因此必须通过纸色谱法分离 L,L-形式的二
氨基丙二酸。
乙酰氨基丙二酸二乙酯-(2-14C)与 4-
溴丁基-或 5-
溴戊基-或 6-
溴己基
乙酰氨基丙二酸二乙酯烷基化,然后
水解缩合产物,分别得到 D,
L-2,7-二
氨基
丁二酸-(2-14C)、D,
L-2,8-二
氨基
壬二酸-(2-14C)和 D,
L-2,8-二
氨基
二十二酸-(2-14C)。