Design of a robust Ru(salen) complex: aziridination with improved turnover number using N-arylsulfonyl azides as precursorsElectronic supplementary information (ESI) available: typical experimental procedures, determination of enantiomeric excess and elementary analysis for complexes 3 and 5. See http://www.rsc.org/suppdata/cc/b4/b407693a/
A new robust fluorinated (OC)Ru(salen) complex was designed on the basis of an X-ray structure of its parent complex to show improved turnover numbers (up to 878) and enantioselectivities (up to 99%) in aziridination reactions using p-toluenesulfonyl (Ts) or p-nitrobenzenesulfonyl (Ns) azide as the nitrene precursor; the latter is synthetically advantageous since the Ns group is N-protecting and can
A General Strategy for the Synthesis of Enantiomerically Pure Azetidines and Aziridines through Nickel-Catalyzed Cross-Coupling
作者:Kim L. Jensen、Dennis U. Nielsen、Timothy F. Jamison
DOI:10.1002/chem.201500886
日期:2015.5.11
expanded this concept to the synthesis of enantiomerically pure, terminal alkyl aziridines. Coupling of a TMS‐protected aziridine alcohol, followed by acidic work‐up to remove the silyl group, provides 1,2‐amino alcohol products that are readily cyclized to aziridines. Both of these sequences display excellent functional group tolerance and deliver the desired azetidine and aziridine products in good to excellent