Methyl 2-[2-aminoethyl-[2-(5-methyl-2,4-dioxopyrimidin-1-yl)acetyl]amino]acetate 、
9H-fluoren-9-ylmethyl N-[(3R)-3-isothiocyanato-5-(5-methyl-2,4-dioxopyrimidin-1-yl)pentyl]carbamate 以
二氯甲烷 、
N,N-二甲基甲酰胺 为溶剂,
以39%的产率得到methyl 2-[2-[[(3R)-1-(9H-fluoren-9-ylmethoxycarbonylamino)-5-(5-methyl-2,4-dioxopyrimidin-1-yl)pentan-3-yl]carbamothioylamino]ethyl-[2-(5-methyl-2,4-dioxopyrimidin-1-yl)acetyl]amino]acetate