What question did this study set out to answer?

The aim is to create complex α,β-dehydroamino acids using a stable catalytic method.

February 2, 2026Organic Letters0 citationsOpen Access

Phosphine-Catalyzed Regio- and Stereoselective Umpolung Addition of Amides to Alkynoates: Access to Complex α,β-Dehydroamino Acid Derivatives

NBNicklas W. BuchbinderVirginia Tech KDKyle DunnavantVirginia Tech ABAndrew D. BageVirginia Tech

Key Points

The aim is to create complex α,β-dehydroamino acids using a stable catalytic method.
Utilized phosphine (PBu3) as a catalyst for umpolung reactivity.
Applied organocatalytic techniques to install primary amides on α-carbon of alkynoates.
Maintained excellent stereoselectivity in the reaction.
Achieved good yields of α,β-dehydroamino acids.
Demonstrated high selectivity for the (Z)-isomer.
Synthesis validated through the creation of two natural products, including a diketopiperazine.

Abstract

Accessing complex α,β-dehydroamino acids remains challenging due to the instability of the enamine product during N-terminal deprotection. We report a mild, organocatalytic method for the installation of primary amides on the α-carbon of alkynoates that avoids N-terminal deprotection. The PBu3 catalyst is key to umpolung reactivity and affords α,β-dehydroamino acids in good yield with excellent (Z)-selectivity. The utility of this reaction was demonstrated in the synthesis of two natural products: a 2,5-diketopiperazine and scutianene M.

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Cite This Study

Buchbinder et al. (Thu,) studied this question.

synapsesocial.com/papers/6980fcb6c1c9540dea80e776 https://doi.org/https://doi.org/10.1021/acs.orglett.5c04858

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