乙醛酸乙酯 、
5-[(E)-2-(1-Methanesulfonyl-piperidin-2-yl)-vinyl]-3,4-dihydro-2H-pyridine-1-carboxylic acid benzyl ester 在
氯磷酸二乙酯 、
lithium hexamethyldisilazane 作用下,
生成 (4aR,4bR,9aS,10S,10aR)-11,11-Dioxo-2,3,4,4a,4b,6,7,8,9a,10,10a,11-dodecahydro-1H-11λ
6-thia-9,11a-diaza-benzo[b]fluorene-9,10-dicarboxylic acid 9-benzyl ester 10-ethyl ester