The intermediates (V) of the Sommelet‐Hauser rearrangement of the piperidinium salts (III) are obtained via the ylides (IV) by methylation of the N‐silylmethyl‐2‐phenylpiperidines (I) followed by desilylation.
The N‐methyl‐N‐silylmethylpiperidinium salts (V) are desilylated to form the intermediate methylides mentioned in the title which rearrange, yielding the benzazonines (VI).
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