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The preparation of 2-halotryptamines from tryptamine is described. New stereoselective intramolecular iminium ion spirocyclization methodology for the construction of spiropyrrolidine-3,3'-oxindoles is outlined in synthetic studies of elacomine (1) and isoelacomine (2). reaction: see text
Miyake et al. (Tue,) studied this question.
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