Acid-Mediated Ring-Expansion Reaction of <i>N</i>-Aryl-2-vinylazetidines: Synthesis and Unanticipated Reactivity of Tetrahydrobenzazocines
作者:Tomoaki Shimizu、Shunsuke Koya、Ryu Yamasaki、Yuichiro Mutoh、Isao Azumaya、Kosuke Katagiri、Shinichi Saito
DOI:10.1021/jo500249c
日期:2014.5.16
The aza-Clasen rearrangement of N-aryl-2-vinylazetidines has been explored. N-Aryl-2-vinylazetidines were transformed to corresponding tetrahydrobenzazocines in good yields. Unexpectedly, the tetrahydrobenzazocine was unstable and readily isomerized to vinyltetrahydroquinoline in the presence of acid. The mechanism of this ring contraction was studied in detail.