Cyclisation of N-(3,4-dimethoxyphenylacetyl)tryptamine (4) with either phosphorus trichloride, or phosphoryl chloride, affords the spirocyclic indolin (12) together with small amounts of β-carboline derivatives, whereas with trifluoroacetic anhydride as reagent the spirocyclic indoline(13) is formed in quantitative yield.
K. M. Biswas and A. H. Jackson, J. Chem. Soc., Chem. Commun., 1983, 85 DOI: 10.1039/C39830000085
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