(S6)-6-((S)-sec-butyl)-8-(naphthalen-1-ylmethyl)hexahydro-4H-pyrazino[1,2-a]pyrimidine-4,7(6H)-dione 、
2-Chloro-4-fluoro-1-(isocyanatomethyl)benzene 以
二氯甲烷 为溶剂,
以19 %的产率得到(6S)-6-((S)-sec-butyl)-N-(2-chloro-4-fluorobenzyl)-8-(naphthalen-1-ylmethyl)-4,7-dioxohexahydro-2H-pyrazino[1,2-a] pyrimidine-1(6H)-carboxamide