1-((methylsulfonyl)methyl)bicycle[3.1.0]hexan-2-one 、 6-(3-chloro-4-fluorobenzyl)-4-hydroxy-3,5-dioxo-2,3,5,6,7,8-hexahydro-2,6-naphthyridine-1 carboxamide 在
硫酸 作用下,
以
1,4-二氧六环 为溶剂,
反应 0.5h,
以14%的产率得到8-[(3-chloro-4-fluoro-phenyl)methyl]-6-hydroxy-5'-(methylsulfonylmethyl)spiro[9,10-dihydro-2H-imidazo[5,1-a][2,6]naphthyridine-3,4'-bicyclo[3.1.0]hexane]-1,5,7-trione