2,2-dihydroxy-1-(1-(methoxymethyl)-1H-indol-3-yl)ethan-1-one 、
ethyl 3-[1-(methoxymethyl)indol-3-yl]-2-[(triphenyl-λ5-phosphanylidene)amino]prop-2-enoate 在
1-methyl-3-methylimidazol-3-ium tetrafluoroborate 作用下,
反应 0.42h,
以76%的产率得到ethyl 1-[(1H-indole-3-yl)carbonyl]-9H-pyrido[3,4-b]indole-3-carboxylate