Arylethynyltrifluoroborate Dienophiles for on Demand Activation of IEDDA Reactions.
Arylethynyltrifluoroborate Dienophiles for on Demand Activation of IEDDA Reactions.
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DOI:
10.1021/acs.bioconjchem.1c00276
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发表时间:
2021-08-18
影响因子:
4.7
通讯作者:
Bernardes GJL
中科院分区:
文献类型:
--
作者:
Zawada Z;Guo Z;Oliveira BL;Navo CD;Li H;Cal PMSD;Corzana F;Jiménez-Osés G;Bernardes GJL
Strained alkenes and alkynes are the predominant dienophiles used in inverse electron demand Diels–Alder (IEDDA) reactions. However, their instability, cross-reactivity, and accessibility are problematic. Unstrained dienophiles, although physiologically stable and synthetically accessible, react with tetrazines significantly slower relative to strained variants. Here we report the development of potassium arylethynyltrifluoroborates as unstrained dienophiles for fast, chemically triggered IEDDA reactions. By varying the substituents on the tetrazine (e.g., pyridyl- to benzyl-substituents), cycloaddition kinetics can vary from fast (k2 = 21 M–1 s–1) to no reaction with an alkyne-BF3 dienophile. The reported system was applied to protein labeling both in the test tube and fixed cells and even enabled mutually orthogonal labeling of two distinct proteins.
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