A covalent triazine framework-based heterogenized Al–Co bimetallic catalyst for the ring-expansion carbonylation of epoxide to β-lactone
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A covalent triazine framework-based heterogenized Al–Co bimetallic catalyst for the ring-expansion carbonylation of epoxide to β-lactone
b-Lactones are important intermediates for ring-opening polymerization to form poly(b-hydroxyalkanoates), a naturally occurring biodegradable and thermoplastic polyester. Many synthetic methods are available for preparing b-lactones, among which catalytic ring-opening carbonylation of epoxides has received considerable attention because of its ability to produce enantiopure b-lactones. Over the...
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The first asymmetric ring-expansion carbonylation of meso-epoxides to β-lactones is reported. Two structurally diverse chiral Cr(III) chloro complexes in conjunction with Co(2)(CO)(8) were shown to be competent catalytic systems for this transformation, displaying significant levels of asymmetric induction of up to 56% ee.
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ژورنال
عنوان ژورنال: RSC Advances
سال: 2017
ISSN: 2046-2069
DOI: 10.1039/c6ra26828e