142819-94-1Relevant articles and documents
Chemoselectivity and stereoselectivity of cyclisation of α-diazocarbonyls leading to oxygen and sulfur heterocycles catalysed by chiral rhodium copper catalysts
Ye, Tao,Garcia, Concepcion Fernandez,McKervey, M. Anthony
, p. 1373 - 1380 (2007/10/02)
Good levels of enantioselectivity have been achieved in intramiolecular C-H insertion reactions of α-diazocarbonyl compounds leading to six-membered oxygen heterocycles (chromanones) through the use of chiral rhodium(II) carboxylates as catalysts.Competition between C-H insertion and sigmatropic rearrangement, the latter leading to five-membered oxygen heterocycles (furanones), was observed with precursors containing a proximal O-allyl side chain.Whereas rhodium carboxylates produced C-H insertion products predominantly, a copper catalyst produced sigmatropic rearrangement products exclusively.A precursor with S-allyl side chain exhibited cyclisation via sigmatropic rearrangement with both copper and rhodium catalyst.
A New Rhodium(II) Phosphate Catalyst for Diazocarbonyl Reactions Including Asymmetric Synthesis
McCarthy, Noreen,McKervey, M. Anthony,Ye, Tao,McCann, Malachy,Murphy, Eamonn,Doyle, Michael P.
, p. 5983 - 5986 (2007/10/02)
A new homochiral Rh(II) complex, Rh22*5H2O, where (+)phosH represents (S)-(+)-1,1'-binaphthyl-2,2'-diyl hydrogen phosphate, has been prepared and used as a catalyst for reactions of diazocarbonyl compounds leading to enantioselective 2,3-s