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[3 + 2] Cycloaddition of Nitrile Imines with Enamides: An Approach to Functionalized Pyrazolines and Pyrazoles

Liangcheng Tu, Limei Gao, Xiaomeng Wang, Ruijie Shi, Rupei Ma, Junfei Li, Xiaoshuang Lan, Yongsheng Zheng, Ji‐Kai Liu

2020The Journal of Organic Chemistry34 citationsDOI

Abstract

An efficient [3 + 2] cycloaddition of in situ generated nitrile imines with enamides has been established. A wide range of functionalized pyrazoline derivatives (53 examples) were obtained in moderate to good yields (up to 96%) under very mild conditions. This protocol features broad substrate scope, good functional group tolerance, and operational simplicity. Practical transformation of the products into useful pyrazoles via a one-pot process and the scalability of this protocol highlight the utility of this synthetic methodology.

Topics & Concepts

NitrileCycloadditionFunctional groupCombinatorial chemistryChemistryProtocol (science)PyrazolineScope (computer science)Substrate (aquarium)Computer scienceOrganic chemistryCatalysisPolymerMedicinePathologyOceanographyProgramming languageGeologyAlternative medicineSynthesis and Catalytic ReactionsClick Chemistry and ApplicationsCatalytic C–H Functionalization Methods
[3 + 2] Cycloaddition of Nitrile Imines with Enamides: An Approach to Functionalized Pyrazolines and Pyrazoles | Litcius