Intermolecular Regio‐ and Stereoselective Hetero‐[5+2] Cycloaddition of Oxidopyrylium Ylides and Cyclic Imines

We have developed the first intermolecular hetero‐[5+2] cycloaddition reaction between oxidopyrylium ylides and cyclic imines with excellent control of regio‐ and stereoselectivity. Surprisingly, divergent stereochemistry was observed depending on the substitution pattern of the oxidopyrylium ylide....

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Published inAngewandte Chemie International Edition Vol. 58; no. 3; pp. 887 - 891
Main Authors Zhao, Changgui, Glazier, Daniel A., Yang, Daoshan, Yin, Dan, Guzei, IIia A., Aristov, Michael M., Liu, Peng, Tang, Weiping
Format Journal Article
LanguageEnglish
Published WEINHEIM Wiley 14.01.2019
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Abstract We have developed the first intermolecular hetero‐[5+2] cycloaddition reaction between oxidopyrylium ylides and cyclic imines with excellent control of regio‐ and stereoselectivity. Surprisingly, divergent stereochemistry was observed depending on the substitution pattern of the oxidopyrylium ylide. This new reaction provides quick access to highly substituted nitrogen‐containing seven‐membered rings—azepanes. Notably, a broad range of oxidopyrylium ylides and cyclic imines participate in this novel hetero‐[5+2] cycloaddition reaction and the cycloadducts can be readily transformed into the core skeletons of bioactive natural products. DFT calculations revealed that the cycloaddition proceeds through a stepwise pathway and the imine nitrogen atom serves as the nucleophile to initiate the cycloaddition. Step by step: A hetero‐[5+2] cycloaddition of oxidopyrylium ylides and cyclic imines has been realized. This method provides efficient access to highly substituted azepane scaffolds. DFT calculations indicate that a stepwise mechanism is favored over a concerted one.
AbstractList We have developed the first intermolecular hetero‐[5+2] cycloaddition reaction between oxidopyrylium ylides and cyclic imines with excellent control of regio‐ and stereoselectivity. Surprisingly, divergent stereochemistry was observed depending on the substitution pattern of the oxidopyrylium ylide. This new reaction provides quick access to highly substituted nitrogen‐containing seven‐membered rings—azepanes. Notably, a broad range of oxidopyrylium ylides and cyclic imines participate in this novel hetero‐[5+2] cycloaddition reaction and the cycloadducts can be readily transformed into the core skeletons of bioactive natural products. DFT calculations revealed that the cycloaddition proceeds through a stepwise pathway and the imine nitrogen atom serves as the nucleophile to initiate the cycloaddition. Step by step: A hetero‐[5+2] cycloaddition of oxidopyrylium ylides and cyclic imines has been realized. This method provides efficient access to highly substituted azepane scaffolds. DFT calculations indicate that a stepwise mechanism is favored over a concerted one.
We have developed the first intermolecular hetero‐[5+2] cycloaddition reaction between oxidopyrylium ylides and cyclic imines with excellent control of regio‐ and stereoselectivity. Surprisingly, divergent stereochemistry was observed depending on the substitution pattern of the oxidopyrylium ylide. This new reaction provides quick access to highly substituted nitrogen‐containing seven‐membered rings—azepanes. Notably, a broad range of oxidopyrylium ylides and cyclic imines participate in this novel hetero‐[5+2] cycloaddition reaction and the cycloadducts can be readily transformed into the core skeletons of bioactive natural products. DFT calculations revealed that the cycloaddition proceeds through a stepwise pathway and the imine nitrogen atom serves as the nucleophile to initiate the cycloaddition.
Author Zhao, Changgui
Glazier, Daniel A.
Yin, Dan
Tang, Weiping
Yang, Daoshan
Liu, Peng
Guzei, IIia A.
Aristov, Michael M.
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Issue 3
Keywords VINYL AZIRIDINES
azepanes
oxidoprylium ylide
imines
ALKYNES
[5+2] cycloaddition
heterocycles
RING
3-ACYLOXY-1,4-ENYNES
CHIRALITY
ACCESS
INTRAMOLECULAR 5+2 CYCLOADDITION
ALKALOIDS
Language English
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Snippet We have developed the first intermolecular hetero‐[5+2] cycloaddition reaction between oxidopyrylium ylides and cyclic imines with excellent control of regio‐...
We have developed the first intermolecular hetero-[5+2] cycloaddition reaction between oxidopyrylium ylides and cyclic imines with excellent control of regio-...
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SubjectTerms [5+2] cycloaddition
azepanes
Chemistry
Chemistry, Multidisciplinary
Cycloaddition
heterocycles
Imines
Natural products
Nitrogen
oxidoprylium ylide
Physical Sciences
Science & Technology
Stereochemistry
Stereoselectivity
Substitution reactions
Title Intermolecular Regio‐ and Stereoselective Hetero‐[5+2] Cycloaddition of Oxidopyrylium Ylides and Cyclic Imines
URI https://onlinelibrary.wiley.com/doi/abs/10.1002%2Fanie.201811896
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https://www.ncbi.nlm.nih.gov/pubmed/30476368
https://www.proquest.com/docview/2164116025
Volume 58
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