Formal Cyclopropylation of Imines with Cyclopropanols: Stereocontrolled Access to Conformationally Constrained γ‐Amino Alcohols

γ-Amino alcohols are essential motifs in bioactive compounds and chiral catalysts, yet the synthesis of their conformationally constrained variants remains challenging due to the lack of suitable methodologies. Here, we report a formal cyclopropylation of imines with cyclopropanols, enabling the construction of previously inaccessible cyclopropane-embedded γ-amino alcohols. This transformation leverages the unique reactivity of enolized zinc homoenolates, which effectively act as a β-hydroxycyclopropyl anions and engage imines through a sequence of Mannich addition and ring closure. The key to this reactivity lies in the use of bulky N-heterocyclic carbene (NHC) ligands, which promote efficient coupling with N-sulfonyl aldimines as well as chiral N-sulfinyl trifluoromethyl-ketimines while ensuring excellent diastereocontrol over three contiguous stereocenters. Furthermore, the resulting γ-amino alcohols can be transformed into β- or γ-aminofunctionalized ketones via homoenolate or β-keto radical intermediates, offering versatile platforms for downstream derivatization.

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Publication Details

Journal
Angewandte Chemie International Edition
Published
2025-08-11
DOI
https://doi.org/10.1002/anie.202511646
Citations
2
Primary Topic
Cyclopropane Reaction Mechanisms
Type
article
Field-Weighted Citation Impact
1.87

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article

Formal Cyclopropylation of Imines with Cyclopropanols: Stereocontrolled Access to Conformationally Constrained γ‐Amino Alcohols

Eunsang Kwon, Naohiko Yoshikai, Kazuya Kanemoto
2 citations
Angewandte Chemie International Edition
Cyclopropane Reaction Mechanisms
1.87
article

Formal Cyclopropylation of Imines with Cyclopropanols: Stereocontrolled Access to Conformationally Constrained γ‐Amino Alcohols

Eunsang Kwon, Naohiko Yoshikai, Kazuya Kanemoto
article en
2 citations

Abstract

γ-Amino alcohols are essential motifs in bioactive compounds and chiral catalysts, yet the synthesis of their conformationally constrained variants remains challenging due to the lack of suitable methodologies. Here, we report a formal cyclopropylation of imines with cyclopropanols, enabling the construction of previously inaccessible cyclopropane-embedded γ-amino alcohols. This transformation leverages the unique reactivity of enolized zinc homoenolates, which effectively act as a β-hydroxycyclopropyl anions and engage imines through a sequence of Mannich addition and ring closure. The key to this reactivity lies in the use of bulky N-heterocyclic carbene (NHC) ligands, which promote efficient coupling with N-sulfonyl aldimines as well as chiral N-sulfinyl trifluoromethyl-ketimines while ensuring excellent diastereocontrol over three contiguous stereocenters. Furthermore, the resulting γ-amino alcohols can be transformed into β- or γ-aminofunctionalized ketones via homoenolate or β-keto radical intermediates, offering versatile platforms for downstream derivatization.

Angewandte Chemie International EditionVol. 64(39)
Tohoku University (JP)
Naito Foundation, Takeda Science Foundation, Japan Society for the Promotion of Science
Clean water and sanitation
Openalex Percentile: Top 14%
Cyclopropane Reaction Mechanisms
1.87
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Formal Cyclopropylation of Imines with Cyclopropanols: Stereocontrolled Access to Conformationally Constrained γ‐Amino Alcohols — Eunsang Kwon, Naohiko Yoshikai, et al. · Angewandte Chemie International Edition (2025) | TGRS Research Map | TGRS