By developing gem-difluoromethylene allenes as viable partners,regiocontrolled Rh(Ⅲ)-catalyzed redoxneutral C-C coupling/C-N cyclization has been realized to build the pyridin-2(1H)-one motifs with the embedment of a...By developing gem-difluoromethylene allenes as viable partners,regiocontrolled Rh(Ⅲ)-catalyzed redoxneutral C-C coupling/C-N cyclization has been realized to build the pyridin-2(1H)-one motifs with the embedment of a Z-configured monofluoroalkene functionality,in which either(hetero)aromatic or vinylic amides were found to be compatible.Integrated experimental and computational mechanistic studies revealed that a tandem regioselective allene 1,2-insertion/β-H elimination/hydrogen transfer/oxidative addition/cyclization/cis-β-F elimination involving an unconventional Rh(Ⅲ)-Rh(I)-Rh(Ⅲ)catalytic cycle accounts for the established transformation.Through further FMO analysis and IGMH maps,a non-covalent weak interaction network between the gem-difluoromethylene part and the OPiv moiety was rationally defined for the unconventional and specific regioselectivity control.展开更多
The Cp;Rh(Ⅲ)-catalyzed asymmetric cascade C-H coupling/intramolecular cyclization of azomethine imines with propargyl carbonates has been developed, affording a variety of chiral tetracyclic indenopyrazolopyrazolone ...The Cp;Rh(Ⅲ)-catalyzed asymmetric cascade C-H coupling/intramolecular cyclization of azomethine imines with propargyl carbonates has been developed, affording a variety of chiral tetracyclic indenopyrazolopyrazolone frameworks with good substrate/functional group tolerance and enantioselectivity(up to 97:3 er). Combined experimental studies and DFT calculations revealed the Rh(Ⅲ)-catalyzed stepwise annulation process and clarified the synergy coordination mode of dual directing groups in tuning the selectivity.展开更多
Acid-controlled,chemodivergent and redox-neutral annulations for the synthesis of isocoumarins and isoquinolinones have been realized via Rh(Ⅲ)-cataIyzed C—H activation.Diazo compounds act as a carbene precursor,and...Acid-controlled,chemodivergent and redox-neutral annulations for the synthesis of isocoumarins and isoquinolinones have been realized via Rh(Ⅲ)-cataIyzed C—H activation.Diazo compounds act as a carbene precursor,and coupling occurs in one-pot process,where adipic acid and trimethylacetic acid promote chemodivergent cyclizations.展开更多
基金the National Natural Science Foundation of China(NSFC,Nos.21877020,22007020)Natural Science Foundation of Guangdong Province(No.2019A1515010935)Science and Technology Program of Guangzhou(No.202102020615)for financial support on this study。
文摘By developing gem-difluoromethylene allenes as viable partners,regiocontrolled Rh(Ⅲ)-catalyzed redoxneutral C-C coupling/C-N cyclization has been realized to build the pyridin-2(1H)-one motifs with the embedment of a Z-configured monofluoroalkene functionality,in which either(hetero)aromatic or vinylic amides were found to be compatible.Integrated experimental and computational mechanistic studies revealed that a tandem regioselective allene 1,2-insertion/β-H elimination/hydrogen transfer/oxidative addition/cyclization/cis-β-F elimination involving an unconventional Rh(Ⅲ)-Rh(I)-Rh(Ⅲ)catalytic cycle accounts for the established transformation.Through further FMO analysis and IGMH maps,a non-covalent weak interaction network between the gem-difluoromethylene part and the OPiv moiety was rationally defined for the unconventional and specific regioselectivity control.
基金National Natural Science Foundation of China (NSFC,Nos.21877020,22007020)Guangdong Natural Science Funds for Distinguished Young Scholar (No.2017A030306031)Natural Science Foundation of Guangdong Province (No.2019A1515010935) for financial support on this study。
文摘The Cp;Rh(Ⅲ)-catalyzed asymmetric cascade C-H coupling/intramolecular cyclization of azomethine imines with propargyl carbonates has been developed, affording a variety of chiral tetracyclic indenopyrazolopyrazolone frameworks with good substrate/functional group tolerance and enantioselectivity(up to 97:3 er). Combined experimental studies and DFT calculations revealed the Rh(Ⅲ)-catalyzed stepwise annulation process and clarified the synergy coordination mode of dual directing groups in tuning the selectivity.
文摘Acid-controlled,chemodivergent and redox-neutral annulations for the synthesis of isocoumarins and isoquinolinones have been realized via Rh(Ⅲ)-cataIyzed C—H activation.Diazo compounds act as a carbene precursor,and coupling occurs in one-pot process,where adipic acid and trimethylacetic acid promote chemodivergent cyclizations.
