Inverse Electron-Demand Diels-Alder Bioconjugation Reactions Using 7-Oxanorbornenes as Dienophiles. 2020

Jordi Agramunt, and Rebecca Ginesi, and Enrique Pedroso, and Anna Grandas
Departament de Quı́mica Inorgànica i Orgànica (Secció de Quı́mica Orgànica), Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain.

Oligonucleotides, peptides, and peptide nucleic acids incorporating 7-oxanorbornene as a dienophile were reacted with tetrazines linked to either a peptide, d-biotin, BODIPY, or N-acetyl-d-galactosamine. The inverse electron-demand Diels-Alder (IEDDA) cycloaddition, which was performed overnight at 37 °C, in all cases furnished the target conjugate in good yields. IEDDA reactions with 7-oxanorbornenes produce a lower number of stereoisomers than that of IEDDA cycloadditions with other dienophiles.

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