3-(4-{4-[3-(2-butoxycarbonyl-ethyl)-2,2,6,6-tetramethyl-1-propoxy-1,2,3,6-tetrahydro-pyridin-4-yl]-piperazin-1-yl}-2,2,6,6-tetramethyl-1-propoxy-1,2,3,6-tetrahydro-pyridin-3-yl)propionic acid butyl ester 在
N-氯代丁二酰亚胺 作用下,
以
二氯甲烷 为溶剂,
反应 8.5h,
以84%的产率得到3-(4-{4-[3-(2-butoxycarbonyl-ethyl)-5-chloro-2,2,6,6-tetramethyl-1-propoxy-1,2,3,6-tetrahydro-pyridin-4-yl]-piperazin-1-yl}-5-chloro-2,2,6,6-tetramethyl-1-propoxy-1,2,3,6-tetrahydro-pyridin-3-yl)propionic acid butyl ester