Synthesis of 3‐Aminopiperidines via I(III)‐Mediated Olefin Diamination with (Hetero)aryl Nucleophiles

3‐Aminopiperidines are a valuable motif present in small molecule pharmaceuticals and bioactive natural products. Synthesis of these moieties via olefin diamination would be an attractive approach, however significant challenges remain with regards to both regioselectivity and exogenous nucleophile...

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Bibliographic Details
Published in:Advanced synthesis & catalysis 2023-08, Vol.365 (16), p.2697-2702
Main Authors: Vazquez‐Lopez, Andres, Allen, James E., Wengryniuk, Sarah E.
Format: Article
Language:English
Subjects:
Chemical synthesis
diamination
hypervalent iodine
Natural products
Nucleophiles
piperidine
pyridinium salt
Reagents
Regioselectivity
Ring opening
Selectivity
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Summary:3‐Aminopiperidines are a valuable motif present in small molecule pharmaceuticals and bioactive natural products. Synthesis of these moieties via olefin diamination would be an attractive approach, however significant challenges remain with regards to both regioselectivity and exogenous nucleophile scope. Herein, we report a metal‐free olefin diamination via a “heterocyclic group transfer“ (HGT) reaction of I(III) N‐HVI reagents, giving rise to 3‐aminopiperidines with high selectivity. The HGT strategy leverages heteroarenes as oxidatively masked amine nucleophiles, giving rise to (hetero)arylonium salt products which are isolated via simple trituration and provide a versatile handle for downstream diversification. This represents only the second 6‐endo selective I(III)‐mediated diamination reaction and mechanistic studies indicate ring opening of an intermediate aziridinium ion is responsible for the 6‐endo selectivity.
ISSN:1615-4150
1615-4169
DOI:10.1002/adsc.202300374