Nucleophilic Attack on Nitrogen in Tetrazines by Silyl-Enol Ethers

20 October 2020, Version 1
This content is a preprint and has not undergone peer review at the time of posting.

Abstract

The nucleophilic addition to nitrogen in 3-monosubstituted s-tetrazines under mild conditions is reported, by using silyl-enol ethers as the nucleophiles and mediated by BF3. The preference for this azaphilic addition over the usually observed inverse electron demand Diels-Alder reactions was determined experimentally and evaluated theoretically. In this regard, the influence of the effect of BF3-coordination to s-tetrazines was investigated thoroughly. The substrate dependency of this unusual reaction was rationalized by determination of the activation barriers and on the basis of the activation strain model by employing density functional theory. Lastly, the decomposition of the unstable adducts was examined and an interesting rearrangement to a triazine derived structure was observed.

Keywords

tetrazine
rearrangments
catalysis
bioorthogonal chemistry
organic synthesis
methodology

Supplementary materials

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