Issue 5, 2021

Thermodynamic and kinetic studies of hydride transfer from Hantzsch ester under the promotion of organic bases

Abstract

Base-promoted hydride transfer (BPHyT), a strategy for the upconversion of hydride donors, was studied here in a three-component system, composed of Hantzsch ester (HEH), acridinium derivatives and organic bases. Based on the thermodynamic parameters of hydricity and pKa, we proposed a thermodynamic cycle to evaluate the apparent hydricity of HEH/base combinations, as well as the overall driving force of BPHyT. Brønsted-type linear analysis indicated that the base used in BPHyT is much more effective to regulate the reaction kinetics, compared to conventional Brønsted acid or base catalysis. Structure–reactivity relationships showed that the hydride acceptor and the base contribute equally to regulate the kinetics of BPHyT. Kinetic isotope effects suggested that the hydride transfer is involved in the rate-determining step. Reductions of the polar C[double bond, length as m-dash]C bonds by HEH/base combinations were performed to confirm the feasibility of applying BPHyT in organic synthesis.

Graphical abstract: Thermodynamic and kinetic studies of hydride transfer from Hantzsch ester under the promotion of organic bases

Supplementary files

Article information

Article type
Research Article
Submitted
25 nov. 2020
Accepted
01 janv. 2021
First published
04 janv. 2021

Org. Chem. Front., 2021,8, 876-882

Thermodynamic and kinetic studies of hydride transfer from Hantzsch ester under the promotion of organic bases

Z. Li, J. Yang and J. Cheng, Org. Chem. Front., 2021, 8, 876 DOI: 10.1039/D0QO01478H

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