ethyl 3-[1-(methoxymethyl)indol-3-yl]-2-[(triphenyl-λ5-phosphanylidene)amino]prop-2-enoate 、
4-氯苯甲醛 在
1-methyl-3-methylimidazol-3-ium tetrafluoroborate 作用下,
反应 2.0h,
以84%的产率得到ethyl 9-methoxymethyl-1-(4-chlorophenyl)-9H-pyrido[3,4-b]indole-3-carboxylate