Cited by 173biodegradable polymer synthesis and propertiesAsymmetric Synthesis and CatalysisAxial and Atropisomeric Chirality Synthesis

From meso-Lactide to Isotactic Polylactide: Epimerization by B/N Lewis Pairs and Kinetic Resolution by Organic Catalysts

Zhu, Jian-Bo, Chen, Eugene Y.-X.·2015·Journal of the American Chemical Society

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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Registry

Crossref · 10.1021/jacs.5b08658

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39 of 39 references verified0 citation errors · 0 not checkable

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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
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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