Bio- and Medicinally Compatible α-Amino-Acid Modification via Merging Photoredox and N-Heterocyclic Carbene Catalysis
摘要:
An N-heterocyclic carbene and photoredox cocatalyzed alpha-amino-acid decarboxylative carbonylation reaction is presented. This method displays good scope generality, providing a direct pathway to access various downstream alpha-amino ketones under bio- and medicinally compatible conditions. Moreover, this strategy is appealing to chemical biology because it has great potential for the chemical modification of peptides or the late-stage synthesis of keto-peptides.
Simple and efficient protocols for the construction of substituted indanes and oxazolines through intramolecular cyclization of beta-hydroxyarylethanamide using trifluoromethanesulfonic acid and titanium tetrachloride in 1,2-dichloroethane respectively have been described. The selectivity due to different acid catalysts was explored and optimized to achieve good to excellent yield. (C) 2013 Elsevier Ltd. All rights reserved.