Increasing interests of difluorinated amino acids(DFAAs)have been raised in recent years due to their widespread bio-organic and medical applications.However,to date,only few investigations focused on their asymmetric...Increasing interests of difluorinated amino acids(DFAAs)have been raised in recent years due to their widespread bio-organic and medical applications.However,to date,only few investigations focused on their asymmetric synthesis.Exploring difluoromethyl reagent to tailor a novel pathway and developing efficient catalytic system are highly desirable for constructing structurally diverse chiral DFAAs.Herein,a copper-catalyzed asymmetric difluorobenzylation of aldimine esters is described.By usingα,α-difluorinated benzyltriflones as difluoromethyl reagents,this protocol allows the asymmetric synthesis ofα-quaternary DFAAs with wide scope,good yields and excellent enantioselectivities(90%-98%ee).Control experiments and DESI-MS analysis demonstrate the reaction probably proceeds via a key difluorocarbocation intermediate.Moreover,polyfluoroarenes are found efficient candidates to polyfluoroaryl amino acids via C-F activation.Gram-scale experiment,late-stage functionalization,synthesis of difluorinated dipeptides and bioactive molecular analogues revealed the utility of the protocol,thereby largely enriching the structural diversity of FAAs and providing more potential opportunities in drug discovery.展开更多
基金supported financially by the Youth Innovation Promotion Association CAS(No.2022375)National Nature Science Foundation of China(No.22171258)+1 种基金the Biological Resources Programme,Chinese Academy of Sciences(No.KFJ-BRP-008)the Sichuan Science and Technology Program(No.2022ZYD0038)。
文摘Increasing interests of difluorinated amino acids(DFAAs)have been raised in recent years due to their widespread bio-organic and medical applications.However,to date,only few investigations focused on their asymmetric synthesis.Exploring difluoromethyl reagent to tailor a novel pathway and developing efficient catalytic system are highly desirable for constructing structurally diverse chiral DFAAs.Herein,a copper-catalyzed asymmetric difluorobenzylation of aldimine esters is described.By usingα,α-difluorinated benzyltriflones as difluoromethyl reagents,this protocol allows the asymmetric synthesis ofα-quaternary DFAAs with wide scope,good yields and excellent enantioselectivities(90%-98%ee).Control experiments and DESI-MS analysis demonstrate the reaction probably proceeds via a key difluorocarbocation intermediate.Moreover,polyfluoroarenes are found efficient candidates to polyfluoroaryl amino acids via C-F activation.Gram-scale experiment,late-stage functionalization,synthesis of difluorinated dipeptides and bioactive molecular analogues revealed the utility of the protocol,thereby largely enriching the structural diversity of FAAs and providing more potential opportunities in drug discovery.
