Organocatalytic Enantioselective Synthesis of Seven‐Membered Ring with Inherent Chirality

doi:10.1002/ange.202319289

Jia-Hao Li, Xiao-Kai Li, Jia Feng, Wang Yao, Huan Zhang, Chuan-Jun Lu, Ren-Rong Liu

Organocatalytic Enantioselective Synthesis of Seven‐Membered Ring with Inherent Chirality

General Medicine

Inherent chirality is used to describe chiral cyclic molecules devoid of central, axial, planar, or helical chirality and has tremendous applications in chiral recognition and enantioselective synthesis. Catalytic and divergent syntheses of inherently chiral molecules have attracted increasing interest from chemists. Herein, we report the enantioselective synthesis of inherently chiral tribenzocycloheptene derivatives via chiral phosphoric acid (CPA)‐catalyzed condensation of cyclic ketones and hydroxylamines. This chemistry paves the way to accessing the less stable derivatives of 7‐membered rings with inherent chirality. A series of chiral tribenzocycloheptene oxime ethers was synthesized in good yields (up to 97%) with excellent enantioselectivities (up to 99% ee).

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Organocatalytic Enantioselective Synthesis of Seven‐Membered Ring with Inherent Chirality

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