excess. These sulfinates were transformed into various enantiomerically pure tert-butyl sulfoxides by reaction with different Grignard reagents. Additionally, the reaction of tert-butylmagnesium chloride with (+)-(R)- and (−)-(S)-methanesulfinates of DAG has been found to occur with complete inversion of configuration and not with retention as previously reported.
General Method for Asymmetric Synthesis of α-Methylsulfinyl Ketones: Application to the Synthesis of Optically Pure Oxisuran and Bioisosteres
作者:H. El Ouazzani、N. Khiar、I. Fernández、F. Alcudia
DOI:10.1021/jo961038q
日期:1997.1.1
compounds led to some epimerization at sulfur. This loss of chirality was circumvented by reacting the alpha-lithio derivatives of the N,N-dimethylhydrazones derived from these ketones with either the (R)- or the (S)-methanesulfinate of diacetone D-glucose, to yield the corresponding alpha-(methylsulfinyl)methylhydrazones, with complete inversion of chirality at sulfur. Hydrolysis of the resulting
Stereoselective synthesis of 3-alkylsulfinylmethylisoxazolines and their use as chiral nucleophiles in the chain elongation of 2,3-O-isopropylidene-d-glyceraldehyde
The reaction of racemic 3-methylisoxazolines and enantiomerically pure (R-S)- and (S-S)-methanesulfinates and (R-S)- and (S-S)-ethanesulfmates of 1,2:5,6-di-O-isopropylidene-D-glucofuranose allows enantiomerically pure 3-alkylsulfinylmethylisoxazolines with both absolute configurations at sulfur to be obtained. One of these has been used as a chiral nucleophile in the four carbon homologation of 2,3-O-isopropylidene-D-glyceraldehyde 17. (C) 2001 Elsevier Science Ltd. All rights reserved.
Noureddine Khiar*{1}, Inmaculada Fernandez*, and Felipe Alcudia, Tetrahedron Lett, 35 (1994) N 31, S 5719-5722
作者:Noureddine Khiar*{1}, Inmaculada Fernandez*, and Felipe Alcudia
DOI:——
日期:——
Rosa, V. Guerrero-de la; Ordonez, M.; LLera, J. M., Synthesis, 1995, p. 761 - 762
作者:Rosa, V. Guerrero-de la、Ordonez, M.、LLera, J. M.、Alcudia, F.