Abstract
Abstract1′‐Methylspiro[3H‐indole‐3,n'‐piperidines] 2 can be obtained from the 1‐methyl‐n‐piperidinecarbaldehydes 1 by the Fischer reaction of their phenylhydrazones. The Fischer reaction provides different kinds of products ‐3H‐indole, indole and oxindole‐ which depend on the N atom position in the piperidine ring.
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