The sulfinyl moiety in Lewis base-promoted allylations
作者:J. Robin Fulton、Lamin M. Kamara、Simon C. Morton、Gareth J. Rowlands
DOI:10.1016/j.tet.2009.09.042
日期:2009.11
By employing Senanayake's oxathiazolidine-2-oxide reagent, a collection of sulfinamides was prepared and provided the first examples of sulfinamides promoting the allylation of benzaldehyde and N-benzoylhydrazones with allyltrichlorosilane. The optimum sulfinamide-derived Lewis base promoter displays comparable activity to the best sulfinyl-based Lewis bases reported. The use of bis-sulfoxides is also discussed. (C) 2009 Elsevier Ltd. All rights reserved.
Indium-Mediated Asymmetric Allylation of Acylhydrazones Using a Chiral Urea Catalyst
作者:Kian L. Tan、Eric N. Jacobsen
DOI:10.1002/anie.200603354
日期:2007.2.12
Asymmetric allylation of N-benzoylhydrazones promoted by novel C2-symmetric bis-sulfoxide organocatalysts
作者:Fred García-Flores、Luz S. Flores-Michel、Eusebio Juaristi
DOI:10.1016/j.tetlet.2006.09.113
日期:2006.11
Novel C-2-symmetric bis-sulfoxide/N-oxide (R,R)-5 was prepared in good yield according to the Andersen protocol with (S)-menthyl p-tolyl sulfinate (2 equiv) and the dilithium derivate of 2,6-dimethylpyridine N-oxide. Reduction of (R,R)-5 to pyridine/ bis-sulfoxide (R,R)-6 was accomplished by means of Katritzky's procedure (Fe-0/AcOH). Both bis-sulfoxides (R,R)-5 and (R,R)-6 are efficient chiral organocatalysts in the asymmetric allylation of N-benzoyl hydrazones derived from both aldehydes and ketones. (c) 2006 Elsevier Ltd. All rights reserved.