Rh(III)-Catalyzed C–H Activation and [4+1+1] Sequential Cyclization Cascade to Give Highly Fused Indano[1,2‑b]azirines
Organic Letters(2022)
摘要
A Rh(III)-catalyzed C–H activation of α-keto oximes and a cyclization cascade with diazo compounds were developed to construct the highly fused indano[1,2-b]azirine frameworks in good yields with a broad range of substrates under mild reaction conditions. More intriguingly, a [4+1+1] sequential annulation cascade is demonstrated for the first time in this reaction and opened a new reaction mode for α-keto oximes. These fused indano[1,2-b]azirine derivatives could also be further transformed into intriguing privileged drug scaffolds.
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