{2-[3-(2,2-dimethyl-propionyl)-4-hydroxy-1-(5-hydroxy-pentyl)-5-oxo-2,5-dihydro-1H-pyrrol-2-yl]-phenoxy}-acetic acid 在
4-二甲氨基吡啶 、 N-cyclohexyl-N'-methyl-polystyrene 作用下,
以
二氯甲烷 为溶剂,
以25%的产率得到3-(2,2-Dimethylpropanoyl)-4-hydroxy-12,15-dioxa-6-azatricyclo[14.4.0.02,6]icosa-1(20),3,16,18-tetraene-5,13-dione