Diamine Synthesis via the Nitrogen-Directed Azidation of sigma- and pi-C-C Bonds
Diamines are essential building blocks for the synthesis of agrochemicals, drugs, and organic materials, yet their synthesis remains challenging, as both nitrogens need to be differentiated and diverse substitution patterns (1,2, 1,3, or 1,4) are required. We report herein a new strategy giving access to 1,2, 1,3, and 1,4 amido azides as orthogonally protected diamines based on the nitrogen-directed diazidation of alkenes, cyclopropanes, and cyclobutanes. Commercially available copper thiophene-2-carboxylate (CuTc, 2 mol %) as catalyst promoted the diazidation of both pi and sigma C-C bonds within 10 min in the presence of readily available oxidants and trimethylsilyl azide. Selective substitution of the formed alpha-amino azide by carbon nucleophiles (electron-rich aromatic, malonate, organosilicon, organoboron, organozinc, and organomagnesium compounds) was then achieved in a one-pot fashion, leading to the formation of 1,2-, 1,3-, and 1,4-diamines with the amino groups protected orthogonally as an amide/carbamate and an azide.
JACS2021-11969GreenAccess1.pdf
Preprint
http://purl.org/coar/version/c_71e4c1898caa6e32
openaccess
CC BY
16.08 MB
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JACS2021-11969GreenAccess.pdf
Postprint
http://purl.org/coar/version/c_ab4af688f83e57aa
embargo
2022-08-02
CC BY
16.79 MB
Adobe PDF
8ff5bb15c64ed39eb910d9f799e5eedd