An Umpolung Approach for the Chemoselective Arylation of Selenocysteine in Unprotected Peptides.
Publication Date (Web): July 30, 2015
Cohen DT1, Zhang C1, Pentelute BL1, Buchwald SL1.
Herein we report an umpolung strategy for the bioconjugation of selenocysteine in unprotected peptides. This mild and operationally simple approach takes advantage of the electrophilic character of an oxidized selenocysteine (Se-S bond) to react with a nucleophilic arylboronic acid to provide the arylated selenocysteine within hours. This reaction is amenable to a wide range of boronic acids with different biorelevant functional groups and is unique to selenocysteine. Experimental evidence indicates that under oxidative conditions the arylated derivatives are more stable than the corresponding alkylated selenocysteine.