What question did this study set out to answer?

The research aims to synthesize N-substituted amino acid steroid lactones using palladium-catalyzed reactions.

March 10, 2026Journal of Heterocyclic Chemistry0 citations

A Straightforward Synthesis of N‐Substituted Amino Acid Steroid Lactones via Pd‐Catalyzed Three‐Component Reactions of Steroid Enol Ethers, Glyoxylic Acid, and Anilines

WGWilliam H. García‐Santos FHFelix E. Hernandez‐Perez MIMartin A. Iglesias‐Arteaga

Key Points

The research aims to synthesize N-substituted amino acid steroid lactones using palladium-catalyzed reactions.
Pd-catalyzed cycloaddition of α-iminocarboxylic acids and steroid enol ethers was performed.
Steroid enol ethers and glyoxylic acid were key reactants in the reaction.
Single diastereomer production was targeted due to specific steric hindrance.
A single diastereomer of amino acid steroid lactones was produced.
High diastereoselectivity was noted due to steric factors around the enol ethers.
The endo mode of cycloaddition predominated, explaining the results.

Abstract

ABSTRACT The Pd‐catalyzed 3 + 2 inverted demand cycloaddition between in situ‐generated α‐iminocarboxylic acids and steroid enol ethers led to a single diastereomer of amino acid steroid lactones. The combination of the steric hindrance around the reaction centers in the enol ethers and the predominance of the endo mode of the cycloaddition explains the highly diastereoselectivity observed.

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