(Z)-3-oxo-2-[(9-oxo-9H-fluoren-4-yl)methylene]butanoic acid isopropyl ester 、 (E)-3-oxo-2-[(9-oxo-9H-fluoren-4-yl)methylene]butanoic acid isopropyl ester 、
2-cyanoethyl 3-aminocrotonate 以
异丙醇 为溶剂,
反应 16.0h,
以68%的产率得到2-cyanoethyl isopropyl 2,6-dimethyl-4-(9-oxo-9H-fluoren-4-yl)-1,4-dihydropyridine-3,5-dicarboxylate