From meso-Lactide to Isotactic Polylactide: Epimerization by B/N Lewis Pairs and Kinetic Resolution by Organic Catalysts
Abstract
B/N Lewis pairs have been discovered to catalyze rapid epimerization of meso-lactide (LA) or LA diastereomers quantitatively into rac-LA. The obtained rac-LA is kinetically polymerized into poly(L-lactide) and optically resolved D-LA, with a high stereoselectivity k(L)/k(D) of 53 and an ee of 91% at 50.6% monomer conversion, by newly designed bifunctional chiral catalyst 4 that incorporates three key elements (β-isocupreidine core, thiourea functionality, and chiral BINAM) into a single organic molecule. The epimerization and enantioselective polymerization can be coupled into a one-pot process for transforming meso-LA directly into poly(L-lactide) and D-LA.
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Chen developed a bifunctional catalyst that combines β-isocupreidine, a previously reported chiral ROP catalyst with low enantioselectivity (kL/kD = 4.4), and a chiral thiourea based on the binaphthyl scaffold.
“Chen developed a bifunctional catalyst that combines b-isocupreidine, a previously reported chiral ROP catalyst with low enantioselectivity (kL/kD = 4.4), 340 and a chiral thiourea based on the binaphthyl scaffold.341”
From Catalysis as an Enabling Science for Sustainable Polymers (2018) · cites this paper as [341]
This catalyst exerts double stereo-differentiation for the ROP of rac-LA with kL/kD up to 53 (for TU-ICD).
“This catalyst exerts double stereo-differentiation for the ROP of rac-LA with kL/kD up to 53 (for TU-ICD, Figure 9).”
From Catalysis as an Enabling Science for Sustainable Polymers (2018) · cites this paper as [341]
The ROP of rac-LA mediated by TU-ICD generated isotactic PLAs (Pm = 0.88) at 25 °C and 50% conversion.
“The ROP of rac-LA mediated by TU-ICD generated isotactic PLAs (Pm = 0.88) at 25 °C and 50% conversion.”
From Catalysis as an Enabling Science for Sustainable Polymers (2018) · cites this paper as [341]
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- Authors
- Zhu, J.-B., & Chen, E. Y.-X.
- Affiliations
- Colorado State University (US)
- Corresponding author
- Chen, Eugene Y.-X.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2015-09-24
- Volume
- 137
- Issue
- 39
- Pages
- 12506-12509
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2409564029
- Cited by
- 173
- References
- 39
- Citations by year
- 2026: 11 · 2025: 15 · 2024: 16 · 2023: 18 · 2022: 20 · 2021: 15 · 2020: 12 · 2019: 14 · 2018: 30 · 2017: 12 · 2016: 10
- FWCI
- 6.26
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of the American Chemical Society (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Division of Chemistry (1300267)
- W.M. Keck Foundation
- Topics
- Physical Sciences › Materials Science › Biomaterials › biodegradable polymer synthesis and properties
- Physical Sciences › Chemistry › Organic Chemistry › Asymmetric Synthesis and Catalysis
- Physical Sciences › Chemistry › Organic Chemistry › Axial and Atropisomeric Chirality Synthesis
- Keywords
- meso-lactide, epimerization, kinetic resolution, organic catalysts, enantioselective polymerization, thiourea, stereoselectivity, one-pot process, L-lactide, D-lactide
- MeSH terms
- Catalysis, Dioxanes, Kinetics, Magnetic Resonance Spectroscopy, Polyesters, Molecular Structure, Lewis Acids
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