A New Method for the Synthesis of 3-Substituted Indoles
摘要:
Starting from readily accessible nitrones and electron-deficient acetylenes, a highly efficient and versatile synthetic protocol for 3-substituted indoles has been developed.
Cycloaddition of Fluorenone <i>N</i>-Aryl Nitrones with Methylenecyclopropanes and Sequential 1,3-Rearrangement: An Entry to Synthesis of Spirofluorenylpiperidin-4-ones
作者:Xiao-Pan Ma、Jie-Feng Zhu、Si-Yi Wu、Chun-Hua Chen、Ning Zou、Cui Liang、Gui-Fa Su、Dong-Liang Mo
DOI:10.1021/acs.joc.6b02544
日期:2017.1.6
highly selective 1,3-rearrangement to give the desired product. The stereochemistry of the spirofluorenylpiperidin-4-one could be controlled by the cycloaddition and sequential rearrangement strategy. Furthermore, the spirofluorenylpiperidin-4-ones could be not only prepared in one-pot procedure but also converted to useful scaffolds by reduction or oxidation conditions.
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
Synthesis of Spirofluorenyl‐
<i>β</i>
‐Lactams through Cycloaddition and Ring Contraction from
<i>N</i>
‐Aryl Fluorenone Nitrones and Methylenecyclopropanes
作者:Cui Wei、Jie‐Feng Zhu、Jin‐Qi Zhang、Qi Deng、Dong‐Liang Mo
DOI:10.1002/adsc.201900523
日期:2019.9.3
three steps from N‐aryl fluorenone nitrones and methylenecyclopropanes through a [3+2] cycloaddition, reduction and subsequent acid‐catalyzed ringcontraction cascade strategy under mild reaction conditions. Experimental studies showed that the stereochemistry remained intact after the ringcontraction step. Furthermore, the obtained spirofluorenyl‐β‐lactam was easily converted to two novel spiroazetidine