(2R-trans)-1-[N-[(1,1-Dimethylethoxy)carbonyl]-O-(phenylmethyl)-L-α-glutamyl]-4-methyl-2-piperidinecarboxylic acid, ethyl ester 以
乙酸乙酯 、
乙腈 为溶剂,
以10 g (17 mmol, 98%)的产率得到(2R-trans)-1-[N,N-Bis[(1,1-dimethylethoxy)carbonyl]-O-(phenylmethyl)-L-α-glutamyl]-4-methyl-2-piperidinecarboxylic acid, ethyl ester