期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 24, 期 53, 页码 14207-14212出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201802478
关键词
1-azaallyl cations; aza-Friedel-Crafts reaction; Lewis acid catalysis; multicomponent reactions; tertiary alcohols
资金
- European Social Fund (ESF)
- Studienstiftung des Deutschen Volkes
The rapid assembly of molecular complexity continues to be at the forefront of novel reaction development. In the pursuit of that goal, we herein report a novel Sc(OTf)(3)-catalyzed, one-pot multicomponent reaction that furnishes complex multicyclic 2-pyrrolines with excellent overall yields and perfect diastereocontrol. This process is based on our previously established (2+2+1)-cycloannulation of in situ generated 1-azaallyl cations, 1,3-dicarbonyls and primary amines. The newly formed and highly reactive aminal moiety is readily substituted with indoles and pyrroles both as external and internal -nucleophiles to provide densely functionalized N-heterocycles with four new sigma-bonds and two vicinal quaternary stereogenic centers. In addition, DFT calculations have been conducted to further characterize the intermediate 1-azaallyl cations.
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