Synthesis of Stereocontrolled Degradable Polymer by Living Cascade Enyne Metathesis Polymerization

• Published in: Angewandte Chemie Vol. 135; no. 46
• Main Authors: Koo, Bonwoo, Kim, Cheoljae
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 13-11-2023
• Subjects: Asymmetric Hydroamination; Block copolymers; Chemical synthesis; Chemistry; Chiral Polymer; Degradable Polymer; Degradation; Diels-Alder reactions; Living Polymerization; Metathesis; Metathesis Polymerization; Monomers; Polymerization; Polymers; Stereochemistry
• ISSN: 0044-8249; 1521-3757
• DOI: 10.1002/ange.202312399

A stereocontrolled degradable polymer was synthesized via living cascade enyne metathesis polymerization. Highly stereodefined N,O‐acetal‐containing enyne monomers were prepared using the Pd‐catalyzed hydroamination of alkoxyallenes and ring‐closing metathesis. The resulting chiral polymer exhibited a narrow dispersity window. Block copolymers were prepared not only by sequentially adding nondegradable and degradable monomers but also by using enantiomerically different monomers to produce stereocontrolled blocks. Owing to the hydrolyzable N,O‐acetal moiety in the backbone structure, the resulting polymer could degrade under acidic conditions generated using various acid concentrations to control the degradation. Additionally, the aza‐Diels–Alder reaction modified the polymer without losing the stereochemistry.
A stereocontrolled degradable polymer was synthesized via living cascade enyne metathesis polymerization from highly stereodefined N,O‐acetal‐containing enyne monomers, which were prepared by Pd‐catalyzed asymmetric hydroamination of alkoxyallene and ring‐closing metathesis.