乙烯基乙醚 、
1-Benzenesulfonyl-2-[1-(4-nitro-phenyl)-meth-(E)-ylidene]-1,2-dihydro-pyrrolo[2,3-b]pyridin-3-one 在
tris(6,6,7,7,8,8,8-heptafluoro-2,2-dimethyl-3,5-octanedionato)ytterbium 作用下,
反应 3.5h,
生成 (6S,8R)-9-Benzenesulfonyl-6-ethoxy-8-(4-nitro-phenyl)-6,7,8,9-tetrahydro-5-oxa-1,9-diaza-fluorene 、 (6R,8R)-9-Benzenesulfonyl-6-ethoxy-8-(4-nitro-phenyl)-6,7,8,9-tetrahydro-5-oxa-1,9-diaza-fluorene