N-[[1-[2-[[(1,1-dimethylethoxy)carbonyl]amino]ethyl]cyclopentyl]carbonyl]-4-nitro-L-phenylalanine methyl ester 、
劳森试剂 、 在
crude product 、 silica gel 、
ethyl acetate n-hexane 作用下,
以
Dioxane toluene 为溶剂,
反应 24.0h,
以4:1), afforded N-[[1-[2-[[(1,1-dimethylethoxy)carbonyl]amino]ethyl]cyclopentyl]thioxomethyl]-4-nitro-L-phenylalanine methyl ester (460 mg, 44%; 65% based on recovered starting material) as a light yellow oil的产率得到N-[[1-[2-[[(1,1-dimethylethoxy)carbonyl]amino]ethyl]-cyclopentyl]thioxomethyl]-4-nitro-L-phenylalanine methyl ester