Ethyl 2-bromo-2-[(4-fluorophenyl)hydrazinylidene]acetate 、
9α-hydroxyparthenolide 在
caesium carbonate 作用下,
以
二氯甲烷 为溶剂,
反应 3.0h,
以80%的产率得到ethyl (3R,5R,9aR,10aS,10bS,E)-2'-(4-fluorophenyl)-5-hydroxy-6,9a-dimethyl-2-oxo-2',3a,4,4',5,8,9,9a,10a,10b-decahydro-2H-spiro[oxireno[2',3':9,10]cyclodeca[1,2-b]furan-3,3'-pyrazole]-5'-carboxylate