Ethyl Acetate → 4-[5-Amino-4-(2-hydroxymethyl-pyrrolidine-1-carbonyl)-2-methoxy-phenoxy]-butyric acid methyl ester

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Reaction Steps

The nitro ester 14 (38.4 g, 97 mmol) was dissolved in ethanol (2 batches of 19.2 g in 200 mL ethanol per 500 mL hydrogenation flask). 10% Pd/C was added as a slurry in ethanol (1 g per batch) and the mixture was hydrogenated in a Parr hydrogenation apparatus at 40 psi until no further hydrogen uptake was observed. Reaction completion was confirmed by TLC analysis (EtOAc) and the mixture was filtered through celite. The solvent was removed in vacuo and the amine 15 was used directly in the next step. (35.4 g, quantitative yield).

Provenance & Evidence