(S6)-6-((S)-sec-butyl)-8-(naphthalen-1-ylmethyl)hexahydro-4H-pyrazino[1,2-a]pyrimidine-4,7(6H)-dione 、
2-Chloro-1-fluoro-4-(isocyanatomethyl)benzene 以
二氯甲烷 为溶剂,
以22 %的产率得到(6S)-6-((S)-sec-butyl)-N-(3-chloro-4-fluorobenzyl)-8-(naphthalen-1-ylmethyl)-4,7-dioxohexahydro-2H-pyrazino[1,2-a] pyrimidine-1(6H)-carboxamide