The amino acid 2-amino-4-(2-aminoethoxy)-trans-but-3-enoic acid can be conveniently prepared via novel intermediates from a 2,2'-disubstituted diethyl ether and a dialkyl N-protected amidomalonate starting material using a multi-step process. Preferred starting materials are bis-2-chloroethyl ether and diethyl acetamidomalonate. The process, in a preferred embodiment, proceeds through the key intermediate ethyl-2-acetamido-4-[2-(2-phthalimido)ethoxy]-but-2-enoate.
2-
氨基-4-(2-
氨乙氧基)-反-丁-3-烯酸
氨基酸可以通过一种多步反应的方法,方便地从2,2'-二取代的二
乙醚和二烷基N-保护的酰胺
丙二酸酯起始物质中制备出来。首选的起始物质是双-2-
氯乙基醚和乙酰基丙酰胺二酸二
乙酯。在首选实施例中,该过程通过关键中间体乙基-2-乙酰胺基-4-[2-(2-邻苯二甲
酰亚胺)乙氧基]-丁-2-烯酸
乙酯进行。