(Z)-3-oxo-2-[(9-oxo-9H-fluoren-4-yl)methylene]butanitrile 、 (E)-3-oxo-2-[(9-oxo-9H-fluoren-4-yl)methylene]butanitrile 、 (3S)-1-benzyl-2,5-dioxopyrrolidin-3-yl 3-aminobut-2-enoate 以
异丙醇 为溶剂,
反应 10.0h,
以96%的产率得到(3S)-1-benzyl-2,5-dioxopyrrolidin-3-yl 5-cyano-2,6-dimethyl-4-(9-oxo-9H-fluoren-4-yl)-1,4-dihydropyridine-3-carboxylate