How is (S)-2-Amino-4-(7-hydroxy-2-oxo-2H-chromen-4-yl)butanoic acid (CAS: 905442-42-4) typically synthesized?

(S)-2-Amino-4-(7-hydroxy-2-oxo-2H-chromen-4-yl)butanoic acid can be synthesized using a multi-step process involving the condensation of 2-amino-4-bromobutanoic acid with 7-hydroxy-2-oxo-2H-chromen-4-yl bromide. The synthesis typically involves the use of a base such as potassium carbonate as a catalyst, and the reaction is carried out in an appropriate organic solvent like dimethylformamide (DMF). The yield is usually around 70-80%, and the product is purified by recrystallization from water or a suitable organic solvent.