108-24-7
乙酸酐
+
105-36-2
溴代乙酸乙酯
75-05-8
乙腈
→
~83%
26682-94-0
ethyl (Z)-2-acetyl-3-aminobut-2-enoate
89193-18-0
ethyl 3,5-dimethyl-1-phenylpyrazole-4-carboxylate