Nitrophenylacetonitriles as Versatile Nucleophiles in Enantioselective Organocatalytic Conjugate Additions
作者:M. Belén Cid、Sara Duce、Sara Morales、Eduardo Rodrigo、José Luis García Ruano
DOI:10.1021/ol101178u
日期:2010.8.20
able to participate in organocatalyticMichaeladditions to α,β-unsaturated aldehydes by incorporating a nitro group at the phenyl ring, which acts as a temporary activating group in a remote position and allows further transformations. The sequential protocol Michael addition/NaBH4 reduction/lactonization allows the synthesis of diastereomerically pure disubstituted lactones in high yield and optical
<i>p</i>-Nitrophenyl Ethylthioester in Enantioselective Organocatalytic Michael Additions: Different Behaviour of β-Aryl and β-Alkyl Enals
作者:Sara Duce、María Jorge、Inés Alonso、José Luis García Ruano、M. Belén Cid
DOI:10.1002/ejoc.201300934
日期:2013.11
Although several nucleophiles derived from arylacetic acids have been described in catalysis via iminiumactivation, none have presented good enantioselectivity and reactivity with both β-alkyl and β-aryl enals. This study on the Michael addition of p-nitrophenylacetic thioesters suggests that this behavior is due to the different reactivity and distinct tendency to reversibility exhibited by these