4-(Iodomethyl)-3,5-dimethylisoxazole 、
methyl (3R,7aR)-3-tert-butyl-5,7-dioxo-6-phenyl-1,3-dihydropyrrolo[1,2-c][1,3]oxazole-7a-carboxylate 在
sodium hydride 作用下,
以
四氢呋喃 为溶剂,
以31%的产率得到methyl (3R,6S,7aR)-3-tert-butyl-6-[(3,5-dimethyl-1,2-oxazol-4-yl)methyl]-5,7-dioxo-6-phenyl-1,3-dihydropyrrolo[1,2-c][1,3]oxazole-7a-carboxylate