Ammonia → (S)-[Cyclopentyl-(3-mercapto-2-methyl-propionyl)-amino]-acetic acid

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반응 단계

Ammonia gas was bubbled through a methanolic solution of N-(3-acetylthio-2-methylpropanoyl)-N-cyclopentylglycine (10.4 g, 0.036 mol) for one hour. The reaction mixture was then stoppered and stirred for 30 more minutes and then concentrated. The residue was redissolved in ethyl acetate (400 ml) and was washed with 5% aqueous sodium bisulfate (3×150 ml). The organic portion was then removed, dried (MgSO4), filtered and concentrated. The crude material was further purified by HPLC with ethyl acetate, toluene, hexane, acetic acid (50:25:50:2) as the eluent. The desired product was isolated as a nearly colorelss oil (pale yellowish tinge). 7.9 g (90%) was so obtained.

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