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- W4386606883 endingPage "12552" @default.
- W4386606883 startingPage "12543" @default.
- W4386606883 abstract "2-Aminobiaryls are privileged scaffolds, and their cogent synthesis and diversifications, particularly through the C–H bond activation strategy, are a continuous enterprise in organic synthesis. In this realm, capitalizing on the susceptible native amine (−NH2) directing group is beneficial but increasingly challenging owing to its innate nucleophilic reactivity. Additionally, the C–H activation reactions of this class of substrates have traditionally been restricted to the cross-ring C–H bond, as ortho-C–H functionalization presumably requires the formation of a strained high-energy four-membered metallacycle. Herein, we report the free-amine-directed ortho-C–H activation reaction of 2-aminobiaryls under high-valent Cp*Co(III)-catalysis, enabling regio- and stereoselective allylation reactions in high yields. The protocol engages vinyl cyclopropanes as allyl synthons, where the C–C bond construction event is tunneled to a C–C activation process to forge an internal olefin with exclusive (E)-selectivity. The products were judicially used to access high-value benzo[d]isoxazoles and dihydrophenanthridine derivatives. Mechanistic experiments and DFT calculations have also been conducted to unravel the rationale behind the unique site selectivity, where the thermodynamic constraints of the corresponding intermediates favor the ortho-C–H activation over cross-ring functionalization." @default.
- W4386606883 created "2023-09-12" @default.
- W4386606883 creator A5014439979 @default.
- W4386606883 creator A5025985912 @default.
- W4386606883 creator A5039130832 @default.
- W4386606883 creator A5061525627 @default.
- W4386606883 creator A5085237782 @default.
- W4386606883 date "2023-09-11" @default.
- W4386606883 modified "2023-10-13" @default.
- W4386606883 title "Cobalt(III)-Catalyzed Free-Amine-Directed Site-Selective Allylation in 2-Aminobiaryls with Vinyl Cyclopropanes" @default.
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