A Short Synthesis of a Trifold Orthogonally Protected, Novel Aminoazepanol Building Block
作者:Jens Christoffers、Martina Würdemann
DOI:10.1055/s-0031-1289564
日期:2011.12
Orthogonally protected cis-5-aminoazepan-3-ol derivatives were prepared in three steps from N-Boc allylic amine, acrolein, and N-benzylhydroxylamine with an intramolecular 1,3-dipolar cycloaddition as the key reaction.
Nitrile Oxide versus Nitrone - Switching Regioselectivity of Intramolecular 1,3-Dipolar Cycloadditions towards the Preparation of Aminopiperidinecarboxylates
作者:Martina Würdemann、Jens Christoffers
DOI:10.1002/ejoc.201301039
日期:2013.11
3-(Allylamino)- and 3-(propargylamino)propanal were converted via the corresponding oximes into nitrile oxides, which readily underwent intramolecular 1,3-dipolar cycloadditions to furnish a piperidine-annulated isoxazole or isoxazoline. The annulated isoxazoline was transformed into orthogonally carbamate-protected cis- and trans-4-aminopiperidine-3-carboxylates, both representing interesting scaffolds