tert-butyl (4S)-5-[[(2S)-1-[[(2S)-1-[(2S)-2-[[2-hydroxy-1-oxo-1-(prop-2-enylamino)hex-5-en-3-yl]carbamoyl]pyrrolidin-1-yl]-3-methyl-1-oxobutan-2-yl]amino]-3-methyl-1-oxobutan-2-yl]amino]-4-[[(2S)-4-[(2-methylpropan-2-yl)oxy]-2-[(2-methylpropan-2-yl)oxycarbonylamino]-4-oxobutanoyl]amino]-5-oxopentanoate 以70%的产率得到tert-butyl (4S)-5-[[(2S)-1-[[(2S)-1-[(2S)-2-[[1,2-dioxo-1-(prop-2-enylamino)hex-5-en-3-yl]carbamoyl]pyrrolidin-1-yl]-3-methyl-1-oxobutan-2-yl]amino]-3-methyl-1-oxobutan-2-yl]amino]-4-[[(2S)-4-[(2-methylpropan-2-yl)oxy]-2-[(2-methylpropan-2-yl)oxycarbonylamino]-4-oxobutanoyl]amino]-5-oxopentanoate