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An alternative synthetic route to 3H-azepines: thermal isomerization of 2,4-and 3,5-di-t-butyl-3a,5a-dihydro-3H-cyclobuta[b]pyrroles

✍ Scribed by Satake, Kyosuke; Saitoh, Hidekazu; Kimura, Masaru; Morosawa, Shiro

Book ID
115456831
Publisher
The Royal Society of Chemistry
Year
1988
Tongue
English
Weight
258 KB
Volume
16
Category
Article
ISSN
0022-4936

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## Abstract The condensation of 4‐hydroxy‐6‐methyl‐2__H__‐pyran‐2‐one and substituted 2‐hydroxybenzaldehydes with ammonium acetate gave the title heterocycles. Synthesis of 1,5‐dihydro‐2‐methyl‐4__H__‐[1]naphtho‐[1′,2′:5,6]pyrano[4,3‐__b__]‐pyridine‐4,5‐dione is also described. A reaction mechanism