Carbonylative, Catalytic Deoxygenation of 2,3-Disubstituted Epoxides with Inversion of Stereochemistry: An Alternative Alkene Isomerization Method

Jessica R. Lamb; Aran K. Hubbell; Samantha N. MacMillan; Geoffrey W. Coates

doi:10.1021/jacs.0c02653

Carbonylative, Catalytic Deoxygenation of 2,3-Disubstituted Epoxides with Inversion of Stereochemistry: An Alternative Alkene Isomerization Method

Jessica R. Lamb, Aran K. Hubbell, Samantha N. MacMillan, Geoffrey W. Coates

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

Reactions facilitating inversion of alkene stereochemistry are rare, sought-after transformations in the field of modern organic synthesis. Although a number of isomerization reactions exist, most methods require specific, highly activated substrates to achieve appreciable conversion without side product formation. Motivated by stereoinvertive epoxide carbonylation reactions, we developed a two-step epoxidation/deoxygenation process that results in overall inversion of alkene stereochemistry. Unlike most deoxygenation systems, carbon monoxide was used as the terminal reductant, preventing difficult postreaction separations, given the gaseous nature of the resulting carbon dioxide byproduct. Various alkyl-substituted cis- A nd trans-epoxides can be reduced to trans- A nd cis-alkenes, respectively, in >99:1 stereospecificity and up to 95% yield, providing an alternative to traditional, direct isomerization approaches.

Original language	English (US)
Pages (from-to)	8029-8035
Number of pages	7
Journal	Journal of the American Chemical Society
Volume	142
Issue number	17
DOIs	https://doi.org/10.1021/jacs.0c02653
State	Published - Apr 29 2020
Externally published	Yes

Bibliographical note

Funding Information:
This research was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award DE-FG02-05ER15687. J.R.L. acknowledges a graduate fellowship from the National Science Foundation (DGE-1144153). A.K.H. acknowledges a training grant fellowship from the National Institute of General Medical Sciences (NIGMS T32-GM008500). This content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institute of General Medical Sciences or the National Institutes of Health. This work made use of the NMR Facility at Cornell University which is supported, in part, by the NSF under Award CHE-1531632. We thank Dr. Michael Mulzer for synthesizing various epoxide starting materials.

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© 2020 American Chemical Society.

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Carbonylative, Catalytic Deoxygenation of 2,3-Disubstituted Epoxides with Inversion of Stereochemistry: An Alternative Alkene Isomerization Method. / Lamb, Jessica R.; Hubbell, Aran K.; MacMillan, Samantha N. et al.
In: Journal of the American Chemical Society, Vol. 142, No. 17, 29.04.2020, p. 8029-8035.

Research output: Contribution to journal › Article › peer-review

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abstract = "Reactions facilitating inversion of alkene stereochemistry are rare, sought-after transformations in the field of modern organic synthesis. Although a number of isomerization reactions exist, most methods require specific, highly activated substrates to achieve appreciable conversion without side product formation. Motivated by stereoinvertive epoxide carbonylation reactions, we developed a two-step epoxidation/deoxygenation process that results in overall inversion of alkene stereochemistry. Unlike most deoxygenation systems, carbon monoxide was used as the terminal reductant, preventing difficult postreaction separations, given the gaseous nature of the resulting carbon dioxide byproduct. Various alkyl-substituted cis- A nd trans-epoxides can be reduced to trans- A nd cis-alkenes, respectively, in >99:1 stereospecificity and up to 95% yield, providing an alternative to traditional, direct isomerization approaches.",

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Carbonylative, Catalytic Deoxygenation of 2,3-Disubstituted Epoxides with Inversion of Stereochemistry: An Alternative Alkene Isomerization Method

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