Enantioselective preparation of alkyl alkylsulfanylmethyl sulfoxides and 4,5-dihydroisoxazoles from alkanesulfinates of 1,2 : 5,6-di-O-isopropylidene-<scp>D</scp>-glucose
作者:Yolanda Arroyo-Gómez、Juan A. López-Sastre、Justo F. Rodríguez-Amo、Mercedes Santos-García、María A. Sanz-Tejedor
DOI:10.1039/p19940002177
日期:——
Reaction of (R) and (S)-alkanesulfinates of 1,2:5,6-di-O-isopropylidene-D-glucose (DAG) with methylsulfanylmethyllithium produces their corresponding dithioacetal mono-S-oxides with enantiomeric excesses ranging from 95 to 100%. On the other hand, exo-metallation of 3-methyl-4,5-dihydroisoxazoles and their subsequent reaction with (R)- and (S)-alkanesulfinates of DAG produces optically active 3-ethylsulfinylmethyl-4,5-dihydroisoxazoles.
Kwiatkowski, Stefan; Ostrowski, Stanislaw, Bulletin des Societes Chimiques Belges, 1993, vol. 102, # 4, p. 259 - 270
作者:Kwiatkowski, Stefan、Ostrowski, Stanislaw
DOI:——
日期:——
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.
GRUND H.; JAEGER V., LIEBIGS ANN. CHEM., 1980, NO 1, 80-100