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Tandem Double [3 + 2] Cycloaddition Reactions at Both C‑1 and C‑3 Atoms of N‑Cyanomethylisoquinolinium Ylide
journal contribution
posted on 2017-11-13, 09:13 authored by Rong-Guo Shi, Jing Sun, Chao-Guo YanThe base-promoted
cycloaddition reaction of N-cyanomethylisoquinolinium
chloride with 2-arylidene-1,3-indanediones in dry tetrahydrofuran
resulted in the expected spiro[indene-2,1′-pyrrolo[2,1-a]isoquinoline] derivatives. However, the triethylamine-promoted
three-component reaction of N-cyanomethylisoquinolinium
chloride, aromatic aldehydes, and two molecules of 1,3-indanediones
in acetonitrile afforded unique spiro[benzo[f]imidazo[5,1,2-cd]indolizine-4,2′-indene] derivatives in satisfactory
yields through tandem double [3 + 2] cycloaddition reactions.