(3,3a,7a)-ethyl 1-(3,4-dimethoxyphenethyl)-7a-methoxy-2,5-dioxo-2,5-dioxo-2,3,3a,4,5,7a-hexahydro-1H-indole-3-carboxylate 、 alkaline earth salt of/the/ methylsulfuric acid 在
potassium carbonate 作用下,
以
四氢呋喃 为溶剂,
以48%的产率得到ethyl 3-benzyl-1-(3,4-dimethoxyphenethyl)-5-hydroxy-2-oxoindole-3-carboxylate