Formation of a Disulfide Bridge on the Resin during Solid-Phase Synthesis of Terlipressin: Influence of the Boc-Protected and Free N-Terminal Amino Group
Dmitry Avdeev*, Michael V. Ovchinnikov, Michael G. Medvedev, Alexander S. Molokoedov and Maria V. Sidorova,
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Abstract
An industry-ready approach for the synthesis of terlipressin is developed: the entire peptide chain assembly and subsequent disulfide bond closure are carried out on a polymeric carrier with a specific precaution for the protection of the N-terminal α-amino group. The effect of various factors on the purity of crude disulfide was studied, and the solid-phase cyclization process was optimized. The designed approach has high fidelity and reproducibility and is applicable for a large-scale peptide synthesis (we show it up to 15 g of the pure product). Using molecular modeling, we have found that the state of the N-terminal amino group (free or protected) has a significant influence on the ability of two cysteine side chains to reach each other, paving the way to a rational choice of protecting groups in peptide synthesis.
期刊介绍：
The journal Organic Process Research & Development serves as a communication tool between industrial chemists and chemists working in universities and research institutes. As such, it reports original work from the broad field of industrial process chemistry but also presents academic results that are relevant, or potentially relevant, to industrial applications. Process chemistry is the science that enables the safe, environmentally benign and ultimately economical manufacturing of organic compounds that are required in larger amounts to help address the needs of society. Consequently, the Journal encompasses every aspect of organic chemistry, including all aspects of catalysis, synthetic methodology development and synthetic strategy exploration, but also includes aspects from analytical and solid-state chemistry and chemical engineering, such as work-up tools，process safety, or flow-chemistry. The goal of development and optimization of chemical reactions and processes is their transfer to a larger scale; original work describing such studies and the actual implementation on scale is highly relevant to the journal. However, studies on new developments from either industry, research institutes or academia that have not yet been demonstrated on scale, but where an industrial utility can be expected and where the study has addressed important prerequisites for a scale-up and has given confidence into the reliability and practicality of the chemistry, also serve the mission of OPR&D as a communication tool between the different contributors to the field.
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