Abstract
1. Convenient methods for the synthesis of 2-methyl- and 1,2-dimethyl-4-piperidones are proposed. 2. Several variants of the synthesis of 1-(1,1-dimethyl-2-propynyl)-2-methyl-4-piperidone were examined. 3. 1-p-Tolylsulfonyl derivatives of 4-piperidones do not undergo the amino-exchange reaction when heated with primary amines in presence of caustic alkalies.
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