methyl (2S)-4-[(R,S)-[2-(methoxycarbonyl)ethyl]sulfonimidoyl]-2-[N-[(4-nitrobenzyloxy)carbonyl]amino]butanoate 在
溶剂黄146 作用下,
以69%的产率得到methyl (2S)-4-[(1RS)-4,5-dihydro-1,3-dioxo-3H-1λ6-1,2-thiazol-1-yl]-2-[N-[(4-nitrobenzyloxy)carbonyl]amino]butanoate