Stereocontrolled Synthesis of 1,2- and 1,3-Diamine Building Blocks from Aziridine Aldehyde Dimers
摘要:
Vicinal aziridine-containing diamines have been obtained with high syn-stereoselectivity from readily available aziridine aldehyde dimers in the Petasis borono-Mannich reaction. Subsequent solvent- and/or nucleophile-dependent ring-opening of the aziridine ring yields functionalized 1,2- and 1,3-diamines with high regioselectivity. The ring opening is also influenced by the substitution at the C3 position of the aziridine. A mechanistic rationale for the highly syn-selective three-component reaction is proposed.
Skeletal Fusion of Small Heterocycles with Amphoteric Molecules
作者:Lawrence L. W. Cheung、Zhi He、Shannon M. Decker、Andrei K. Yudin
DOI:10.1002/anie.201106024
日期:2011.12.2
three contiguous stereocenters was prepared from a [3+2] annulation involving amphoteric aziridine aldehydes and isocyanates and further converted to a series of densely functionalized hetercycles, which are difficult to synthesize using established methods. The results highlight the potential of (1,3) amphotericmolecules to construct heterocyclic scaffolds using trivial starting materials.