Journal
ACS CATALYSIS
Volume 11, Issue 22, Pages 13921-13934Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.1c03846
Keywords
rhodium(III) catalysis; C-H activation; domino reaction; furan-2(5H)-ones; 5-hydroxyfuran-2(5H)-ones; DFT calculations
Categories
Funding
- National Natural Science Foundation of China [21602022, 21877020]
- 1000 Talents Program of Sichuan Province
- Chengdu Talents Program
- Chenghua District Talents Program
- Science and Technology Program of Sichuan Province [2018JY0345]
- Guangdong Natural Science Funds for Distinguished Young Scholar [2017 A030306031]
- Shanghai Pujiang Program [21PJ1415800]
Ask authors/readers for more resources
The Rh(III)-catalyzed domino C-H coupling of N-carbamoyl indoles and 4-hydroxy-2-alkynoates enables the streamlined assembly of highly functionalized furan-2(5H)-ones. This method is characterized by efficient multistep cascade triggered by C-H activation, excellent selectivity, and potential biological applications.
Exploring multistep cascade reactions triggered by C-H activation are recognized as appealing, yet challenging. Herein, we disclose a Rh(III)-catalyzed domino C-H coupling of N-carbamoyl indoles and 4-hydroxy-2-alkynoates for the streamlined assembly of highly functionalized furan-2(5H)-ones in which the carbamoyl-directing group (DG) is given a dual role of an auxiliary group and a migrating acylating reagent via the cleavage of stable C-N bonds at room temperature. More importantly, the obtained furan-2(5H)-one skeleton could be further functionalized under air in situ via C5-H hydroxylation by simply switching the solvent or additive, providing fully substituted furan-2(5H)-ones with the installation of an alcohol-based C5 quaternary carbon center. Detailed experimental studies and density functional theory calculations reveal that a Rh(III)-mediated tandem C-H activation/alkyne insertion/DG migration/lactonization accounts for the developed transformation to achieve high functionalities with the observed exclusive selectivity. The potential biological application of the obtained furan-2(5H)-ones as a class of potent PPAR gamma ligands further highlights the synthetic utility of the developed methodology. This protocol is endowed with several salient features including efficient multistep cascade triggered by C-H activation, excellent chemo-, regio-, and stereoselectivity, high bond forming efficiency (e.g., two C-C and two C-O bonds), solvent-or additive-controlled product selectivity, good functional-group compatibility, and mild redox-neutral conditions.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available