2-bromo-4-methyl-2H-furan-5-one 、
methyl 5-methyl-7-oxo-2,3,4,5,6,7-hexahydro-1H-cyclopenta[b]pyridine-1-carboxylate 、
甲酸乙酯 在
potassium tert-butylate 作用下,
以
四氢呋喃 、
乙二醇二甲醚 为溶剂,
以20%的产率得到(E)-methyl 5-methyl-6-((4-methyl-5-oxo-2,5-dihydrofuran-2-yloxy)methylene)-7-oxo-2,3,4,5,6,7-hexahydro-1H-cyclopenta[b]pyridine-1-carboxylate