Recyclable Polythioesters and Poly(thioester‐co‐peptoid)s via Ring‐Opening Cascade Polymerization of Amino Acid N ‐Carboxyanhydrides

作者：Shuo Wang, Zi‐You Tian, Hua Lu · 发表于：Angewandte Chemie International Edition · 年份：2024 · DOI：10.1002/anie.202411630 · 被引用次数：13 · 研究领域：Chemical Synthesis and Analysis、Synthetic Organic Chemistry Methods、Click Chemistry and Applications

Abstract Polythioesters (PTEs) are emerging sustainable polymers for their degradability and recyclability. However, low polymerizability of monomers and extensive side reactions often hampered the polymerization process. Moreover, copolymers containing both thioester and other types of functional groups in the backbone are highly desirable but rarely accomplished owing to several synthetic challenges. Here, we report the ring‐opening cascade polymerization (ROCAP) of N ‐(2‐(acetylthio)ethyl)‐glycine N ‐carboxyanhydrides (TE‐NCA) to afford recyclable PTEs and unprecedented poly(thioester‐co‐peptoid)s (P(TE‐co‐PP)s) in a controlled manner. By developing appropriated carboxylic acid‐tertiary amine dual catalysts, intramolecular S ‐to‐ N acyl shift is coupled into the ROCAP process of TE‐NCA to yield products with dispersity below 1.10, molecular weight ( M n ) up to 84.5 kDa, and precisely controlled ratio of thioester to peptoids. Random copolymerization of sarcosine NCA (Sar‐NCA) and TE‐NCA gives thioester‐embedded polysarcosine with facile backbone degradation while maintaining the water solubility. This work represents a paradigm shift for the ROP of NCAs, enriches the realm of cascade polymerizations, and provides a powerful synthetic approach to functional PTEs and P(TE‐co‐PP)s that are otherwise difficult or impossible to make.