Metal free synthesis of 1‐azaspiro[4.4]nonane‐3‐one system via reactions of nitrones with 1,1‐disubstituted allenes
作者:U. Amrutha、Beneesh P.Babu、Sreedharan Prathapan
DOI:10.1002/jhet.3718
日期:2019.12
In the cycloaddition reaction between fluorenone N‐aryl nitrones and 1,1‐disubstituted allenes, the initially formed cycloadduct underwent facile [1,3] shift to give 1′‐phenylspiro[fluorene‐9,2′‐pyrrolidin]‐4′‐ones. Although 1′‐phenylspiro[fluorene‐9,2′‐pyrrolidin]‐4′‐ones are stable in solid state, a few of them underwent facile aerial oxidation in solution to give the corresponding 1′‐phenylspiro[fluorene‐9
在芴酮N-芳基硝酮与1,1-二取代的烯之间的环加成反应中,最初形成的环加合物进行了容易的[1,3]转移,得到1'-苯基螺[芴],9,2'-吡咯烷酮] -4'-那些。尽管1'-苯基螺[芴-9,2'-吡咯烷] -4'-在固态下是稳定的,但其中一些仍在溶液中容易地进行空中氧化,从而得到相应的1'-苯基螺[芴-9,2] '-吡咯烷] -4',5'-二酮,具有优异的总收率。