AbstractPhototryptophan is a new photoactivatable amino acid designed to be incorporated into tryptophan‐containing peptides for photoaffinity labeling. The synthesis of phototryptophan starts from 6‐bromoindole with the installation of an 1‐azi‐2,2,2‐trifluoroethyl moiety, followed by microwave‐assisted condensation with serine under mild conditions. Separation of the N‐acetylated enantiomers was possible by employing Aspergillus aminoacylase. Differential scanning calorimetry showed that phototryptophan is thermally stable up to 100 °C. Boc‐L‐Phototryptophan was used to assemble a diazirine analog of the marine natural product hemiasterlin.
Comprehensive Synthesis of Photoreactive (3-Trifluoromethyl)diazirinyl Indole Derivatives from 5- and 6- Trifluoroacetylindoles for Photoaffinity Labeling
5- and 6-trifluoromethyldiazirinyl indoles were synthesized from corresponding bromoindole derivatives for the first time. They acted as mother skeletons for the comprehensive synthesis of various bioactive indole metabolites. These can be used in biological functional analysis as diazirine-based photoaffinity labels.
AbstractPhototryptophan is a new photoactivatable amino acid designed to be incorporated into tryptophan‐containing peptides for photoaffinity labeling. The synthesis of phototryptophan starts from 6‐bromoindole with the installation of an 1‐azi‐2,2,2‐trifluoroethyl moiety, followed by microwave‐assisted condensation with serine under mild conditions. Separation of the N‐acetylated enantiomers was possible by employing Aspergillus aminoacylase. Differential scanning calorimetry showed that phototryptophan is thermally stable up to 100 °C. Boc‐L‐Phototryptophan was used to assemble a diazirine analog of the marine natural product hemiasterlin.