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Absolute Quantitation of Phosphopeptides and Glycopeptides Using Coulometric Mass Spectrometry

https://doi.org/10.1021/acsmeasuresciau.5c00047

Tanim-Al_Hassan, Md; Ai, Yongling; Deshaboina, Bhavya; Yaroshuk, Timothy; Sharma, Arjun; Young, Quentin; Dewald, Howard_D; Chen, Hao (July 2025, ACS Measurement Science Au)
Absolute quantitation of peptides and proteins by coulometric mass spectrometry after derivatization

https://doi.org/10.1016/j.ijms.2023.117153

Fnu, Praneeth_Ivan Joel; Hassan, Md Tanim-Al; Yaroshuk, Timothy; Ai, Yongling; Chen, Hao (January 2024, International Journal of Mass Spectrometry)

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Gold‐Catalyzed Diyne‐Ene Annulation for the Synthesis of Polysubstituted Benzenes through Formal [3+3] Approach with Amide as the Critical Co‐Catalyst

https://doi.org/10.1002/anie.202407360

Wei, Jingwen; Pham, Thong; Attah, Emmanuel_Ifeanyi; Liu, Mengjia; Yaroshuk, Timothy; Chen, Hao; Wojtas, Lukasz; Shi, Xiaodong (August 2024, Angewandte Chemie International Edition)

Abstract The one‐step synthesis of tetra‐substituted benzenes was accomplished via gold‐catalyzed diyne‐ene annulation. Distinguished from prior modification methods, this novel strategy undergoes formal [3+3] cyclization, producing polysubstituted benzenes with exceptional efficiency. The critical factor enabling this transformation was the introduction of amides, which were reported for the first time in gold catalysis as covalent nucleophilic co‐catalysts. This interesting protocol not only offers a new strategy to achieve functional benzenes with high efficiency, but also enlightens potential new reaction pathways within gold‐catalyzed alkyne activation processes.
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