ethyl 2-{14,14,15-trimethyl-2,3,5,6,8,9,14,15-octahydro-[1,4,7,10]tetraoxacyclododecino[2,3-g]isoquinolin-12(13H)-ylidene}ethanoate 在
硫酸 作用下,
反应 2.5h,
以74%的产率得到12,14,14,15-tetramethyl-2,3,5,6,8,9,14,15-octahydro[1,4,7,10]tetraoxacyclododecino[2,3-g]isoquinoline