Process for 4-(D-3-amino-3-carboxypropoxy)phenylglyoxylic acid oxime as an amino-protected ester comprising alkylating an amino-protected D-methionine silyl ester with an alkyl or benzyl iodide; cyclizing the alkylsulfonium iodide to an amino-protected D-homoserine lactone; hydrolyzing the lactone to an amino-protected D-homoserine in aqueous base; coupling, to form an ether, the amino-protected D-homoserine as an ester with an ester of 4-hydroxyphenylglyoxylic acid; and forming the oxime of the ether or alternatively coupling the D-homoserine ester with a protected-oxime of an esterified 4-hydroxyphenylglyoxylic acid. The product is useful in preparing the antibiotic FR 1923.
使用4-(D-3-
氨基-3-羧基丙氧基)苯甘酸
肟作为
氨基保护酯的过程包括:用烷基或
苄基碘代物烷基化
氨基保护的
D-蛋氨酸硅酯;环化烷基磺鎓
碘化物为
氨基保护的
D-高丝氨酸内酯;在
水性碱中
水解内酯为
氨基保护的
D-高丝氨酸;将
氨基保护的
D-高丝氨酸作为酯与
4-羟基苯甘酸的酯形成醚的偶联;并形成醚的
肟或者将
D-高丝氨酸酯与保护
肟的酯化
4-羟基苯甘酸偶联。该产品在制备抗生素FR 1923中有用。