Nucleophile Ringöffnung und Fragmentierung von 1-Aza-bicyclo[2.2.0]hexan Fragmentierungs-Reaktionen, 11. Mitteilung
作者:C. A. Grob、V. Krasnobajew
DOI:10.1002/hlca.19640470808
日期:——
1-Aza-bicyclo[2.2.0]hexane (1) is formed in a unimolecular reaction from 2-(2-bromoethyl)-azetidine (13) in aqueous or alcoholic medium. Thermal instability and high reactivity have, however, so far precluded its isolation. Hydrochloric acid, aqueous sodium hydroxide and ethanolic sodium ethoxide convert the bicyclic amine 1 into 4-chloro-, 4-hydroxy- and 4-ethoxy-piperidine, (14), (15) and (16), respectively
1-Aza-双环[2.2.0]己烷(1)在水性或醇性介质中,由2-(2-溴乙基)-氮杂环丁烷(13)在单分子反应中形成。然而,迄今为止,热不稳定性和高反应性阻止了其隔离。盐酸,氢氧化钠水溶液和乙醇乙醇钠将双环胺1分别转化为4-氯-,4-羟基-和4-乙氧基-哌啶,(14),(15)和(16)。在溶液中加热至约80°时,其裂解成N-亚甲基-3-丁烯基胺(17)。这种异常的反应性归因于双环胺1中的应变和伴随的N-C4键的减弱。