Publication
Semi-Reduction of Allenes to Access Deuterated Allylic Isotopomers, Isotopologs, & Enantioisotopomers
Originally published in Angewandte Chemie, February 2026
Authors: Lihan Qi, Raviraj Ananda Thorat, Brad D. Maxwell, Jeffery A. Gladding, Aniel J. Rivera Arzola, Shashank P. Sancheti, Reilly E. Sonstrom, Xulin Tang, Isaac J. Anderson, Brooks H. Pate, Joseph R. Clark
Summary
Originally published in Angewandte Chemie, this research presents a modular copper-catalyzed semi-reductive deuteration of allenes that enables the synthesis of precisely deuterated allylic molecules with exceptional control over deuterium placement and isotopic composition. The method was applied to a broad range of small molecules, drug analogs, and natural product analogs, demonstrating a versatile approach for the preparation of selectively deuterated compounds.
The researchers also demonstrate the first high-enantiopurity synthesis of allylic-d₁ enantioisotopomers, molecules whose chirality arises solely from hydrogen isotope substitution. To characterize these isotopically labeled products, the team employed molecular rotational resonance (MRR) spectroscopy to accurately determine enantiomeric excess and assign absolute configuration. The work highlights the complementary power of precision deuteration chemistry and MRR spectroscopy for the synthesis and characterization of isotopically labeled compounds used in pharmaceutical, mechanistic, and chemical research.
Key Takeaways
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Develops a copper-catalyzed semi-reductive deuteration method for allenes.
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Enables precise deuterium incorporation at allylic positions with control over the degree of deuteration.
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Produces a range of selectively labeled d₁-, d₂-, d₃-, d₅-, and d₇-isotopologs.
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Demonstrates the first high-enantiopurity synthesis of allylic-d₁ enantioisotopomers.
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Applies the methodology to small molecules, drug analogs, and natural product analogs.
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Uses MRR spectroscopy to determine enantiomeric excess and assign absolute configuration.