4-(2(R)-hydroxy-4-methyl-pentanoyl)-piperazine-1-carboxylic acid benzyl ester 在
O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate 、
N,N-二异丙基乙胺 作用下,
以
四氢呋喃 为溶剂,
反应 12.08h,
以41%的产率得到4-[2-(2-{[2-(tert-butoxycarbonyl-methyl-amino)-acetyl]-methyl-amino}-acetoxy)-4-methyl-pentanoyl]-piperazine-1-carboxylic acid benzyl ester