A chiral NHC-catalyzed cycloaddition of γ-fluoroenals is developed. The nucleophilic γ-carbon generated via C-F bond cleavage undergoes highly enantioselective cycloaddition (up to >99% ee) to isatins and provides 3'-spirocyclic oxindoles in good yields (up to 91%).
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http://dx.doi.org/10.1039/c7cc08048d | DOI Listing |
RSC Adv
August 2021
Centre of Advanced Studies, Department of Chemistry, University of Rajasthan Jaipur India
Functionalized graphitic carbon nitride (Sg-CN) has been manufactured and used as a reusable catalyst for the one-pot production of various spiro-pyrano chromenes and spiro indole-3,1'-naphthalene tetracyclic systems in aqueous media. An ultrasound-assisted method has been used for the functionalization of g-CN. The catalytic functionalities and the structural integrity of the catalyst were characterized different analytical tools.
View Article and Find Full Text PDFOrg Biomol Chem
September 2021
Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), Hyderabad-500037, India.
Cycloaddition reactions are of great interest due to their potential and rapid construction of optically enriched spiro-cyclic products. 3-Methyleneindolinones have been proven to be a valuable precursor in cycloaddition reactions for the construction of diverse 3,3'-spirocyclic oxindoles. Their versatile reactivity has provided a new forum for the development of a variety of building blocks and synthetic compounds, including bioactive molecules.
View Article and Find Full Text PDFOrg Lett
May 2021
College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, Zhengzhou 450001, P. R. China.
Two novel diastereoisomeric P-chirogenic phosphine catalysts, i.e., JiaPhos, which can be easily derived from inexpensive and commercially available starting materials in five chemical operations (totally 4.
View Article and Find Full Text PDFOrg Lett
February 2021
Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province, Sichuan Industrial Institute of Antibiotics, School of Pharmacy, Chengdu University, Chengdu 610052, China.
Oxindoles and β-lactams are attractive structural motifs because of their unique biological importance. However, the fusion of the two moieties featuring 3,3'-spirocyclic scaffolds is a challenging task in organic synthesis. Herein we designed a novel type of oxindole-based azaoxyallyl cation synthons, which could readily participate in the [3 + 1] cyclization with sulfur ylides.
View Article and Find Full Text PDFChem Commun (Camb)
February 2018
College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 310018, China.
A chiral NHC-catalyzed cycloaddition of γ-fluoroenals is developed. The nucleophilic γ-carbon generated via C-F bond cleavage undergoes highly enantioselective cycloaddition (up to >99% ee) to isatins and provides 3'-spirocyclic oxindoles in good yields (up to 91%).
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