Gold-catalyzed direct alkynylation of tryptophan in peptides using TIPS-EBX
作者:Gergely L Tolnai、Jonathan P Brand、Jerome Waser
DOI:10.3762/bjoc.12.74
日期:——
biomolecules. In particular, the installation of an alkyne as a useful handle for bioconjugation is highly attractive, but the use of a carbon linker is usually required. Herein, we report the gold-catalyzeddirect alkynylation of tryptophan in peptides using the hypervalent iodine reagent TIPS-EBX (1-[(triisopropylsilyl)ethynyl]-1,2-benziodoxol-3(1H)-one). The reaction proceeded in 50-78% yield under
Biomimetic oxidativedimerization of tryptophan derivatives catalyzed by an iron octacarboxy phthalocyanine complex was established in aqueous media with oxygen as a bulk oxidant. This protocol allows the dimerization of a wide range of tryptophan-containing peptides with remarkable functional-group tolerance to construct natural and unnatural pyrroloindole dimers and dimerizedpeptides with a unique