2(R)-(3,3-dimethylbutanoylamino)-3-(3-(4-methyl-2(R)-(4-methoxyphenyl)pentanoylamino)propylthio)propionic acid 、
三溴化硼 以
二氯甲烷 、
水 为溶剂,
以66%的产率得到3-(3-(2(R)-(4-hydroxyphenyl)-4-methylpentanoylamino)propylthio)-2(R)-(3,3-dimethylbutanoylamino)propionic acid