Michael addition of N-acylaminomalonates to propynoic esters led to the (E)-4-acylamino)-4-carboxy-2-pentenedioic triesters IIa - IIf. On deprotection and decarboxylation, these compounds afforded 2-(N-acylamino)-2-pentenedioic acid derivatives IIIa - IIIc. Dimethyl (E)-4-diazo-2-pentenedioate (IV) was prepared by direct transfer of the diazo group. On treatment of IV with 4-toluenesulfonic acid, 2-(4-toluenesulfonyloxy)-2-pentenedioate (V) was formed. Iodination of (E)-2-pentenedioic acid led directly to the 2,4-diododerivative VII. From dimethyl (E)-4-oxo-2-pentenedioate the oximino ester VIIIa and the free oximino acid VIIIb were prepared.
N-酰胺马隆酸酯与丙炔酸酯的Michael加成反应导致了(E)-4-酰胺-4-羧基-2-戊二酸三酯IIa - IIf。去保护和脱羧后,这些化合物生成了2-(N-酰胺基)-2-戊二酸衍生物IIIa - IIIc。通过直接转移重氮基团制备了二甲基(E)-4-重氮基-2-戊二酸酯IV。将IV与对甲苯磺酸处理后,生成了2-(对甲苯磺酸氧基)-2-戊二酸酯V。对(E)-2-戊二酸的碘化直接导致了2,4-二碘衍生物VII。从二甲基(E)-4-氧基-2-戊二酸酯制备了氧胺酯VIIIa和游离氧胺酸VIIIb。