A New Ring Contraction Rearrangement of 2,5‐ and 3,6‐Di‐tert‐butyl‐3H‐ azepines to Pyridine Derivatives.

Kyosuke Satake,Koichi Takaoka,Michiaki Hashimoto,Hideki Okamoto,Masaru Kimura,Shiro Morosawa

ChemInform（1997）

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摘要

A new ring contraction reaction giving pyridine derivatives from 3,6- and 2,5-di-tert-butyl-3H-azepines was observed by a successive treatment with bromine and aqueous K2CO3. A plausible mechanism via azatropilium cation for the rearrangement was discussed based on the product’s distribution from respective 3H-azepines.

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