N-cyano-iminodiphenylcarbonate 、 1-[4-bromo-3,5-dimethyl-D-phenylalanyl]-4-(1-methyl-4-piperidinyl)piperidine 、
3-(哌啶-4-基)-3,4-二氢喹唑啉-2(1H)-酮 以44%的产率得到1-[4-bromo-N-[[4-(3,4-dihydro-2(1H)-oxoquinazolin-3-yl)-1-piperidinyl]cyanoiminomethyl]-3,5-dimethyl-D,L-phenylalanyl]-4-(1-methyl-4-piperidinyl)piperidine