(S)-1-[(S)-2-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-3-ethylsulfanylcarbonyl-propionyl]-2,3-dihydro-1H-indole-2-carboxylic acid ethyl ester 在
palladium on activated charcoal
三乙基硅烷 作用下,
以
乙腈 为溶剂,
以73%的产率得到(S)-1-[(S)-2-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-4-oxo-butyryl]-2,3-dihydro-1H-indole-2-carboxylic acid ethyl ester