Preparation of deuterium labelled α‐amino‐3‐hydroxy‐5‐methylisoxazole‐4‐propionic acid (AMPA)

Abstract
The preparation of α‐amino‐3‐hydroxy‐5‐methylisoxazole‐4‐propionic acid (AMPA) with deuterium α to the carboxylic acid group (2) and in the exocyclic methyl group (5), respectively, are described. The deuterium labelled AMPA (2) was synthesized by hydrolysis and decarboxylation of the corresponding di‐ester (1), whereas the deuterium labelled AMPA (5) was prepared via a catalytic deuteration of the bromoderivative (3).