benzyloxycarbonyl-L-valyl-L-α-hydroxyisovaleryl-L-valyl-L-α-hydroxyisovaleryl-L-valyl-L-α-hydroxyisovaleryl-L-valyl-L-α-hydroxyisovaleric acid pentafluorophenyl ester 在
palladium on activated charcoal
4-二甲氨基吡啶 、
氢气 作用下,
以
1,4-二氧六环 、
乙醇 为溶剂,
以5%的产率得到cyclo-L-valyl-L-α-hydroxyisovaleryl-L-valyl-L-α-hydroxyisovaleryl-L-valyl-L-α-hydroxyisovaleryl-L-valyl-L-α-hydroxyisovaleryl